The Biography of the Earth

2021 ◽  
pp. 163-180
Author(s):  
Elisabeth Ervin-Blankenheim
Keyword(s):  
Early Life ◽  
Plate Tectonics ◽  
Life Forms ◽  
Snowball Earth ◽  
The Moon ◽  
Geologic Time ◽  
Earth Systems ◽  
Organic Life ◽  
The Earth ◽  
Geologic Record

The way the planet has changed through geologic time, and life on it, the account of the Earth, is the topic of this and the next three chapters, starting in this chapter with the Precambrian Supereon. The overarching principles of geologic time, plate tectonics, and evolution worked dynamically to create the biography of the planet. This chapter traces back to the recesses of the geologic record and early Earth, from its birth and the formation of the Moon through seven-eighths of its existence, a huge span of time. Early life forms emerged during this supereon in the Archean Eon and had a profound influence on other Earth systems. Life interacted and changed the chemistry of the atmosphere through photosynthesis, so much so that the changes are thought to have sent planetary systems over an edge into multiple “Snowball Earth” episodes when most of the planet froze over. In addition to the beginning of organic life and climate, the emergence and configuration of the continents during the Precambrian are covered. Events of this supereon set the stage for the burgeoning of life forms in the next eon, the Phanerozoic.

Introduction

2021 ◽  
pp. 1-5
Author(s):  
Elisabeth Ervin-Blankenheim
Keyword(s):  
Plate Tectonics ◽  
Global Climate ◽  
Life Forms ◽  
Geologic Time ◽  
The Earth ◽  
History Of ◽  
Geologic Record ◽  
Shed Light ◽  
Geologic Processes

Geology offers a unique perspective on the Earth—past, present, and future. It is the language through which the Earth speaks, by means of rocks, geologic processes, the geologic record, and the biography of the Earth. This book explains how geologists arrived at understanding the story of the planet and discusses the three major tenets of geology: geologic time, plate tectonics, and evolution. The development of theories about how the Earth functions is detailed, along with their relevance. Within geology are the keys to understanding the history of the Earth, how that past informs the present, and ways of going forward. The Earth has interacted with life as long as that life has been extant. Life has shaped the Earth and vice versa with times of flowering and the radiation of life forms and other times of extinctions through profound changes in the climate and positions of the continents. These dynamics can shed light on the current changes in and consequences of perturbing the global climate.

Song of the Earth

2021 ◽  
Author(s):  
Elisabeth Ervin-Blankenheim
Keyword(s):  
Climate Change ◽  
Plate Tectonics ◽  
Life Forms ◽  
Historical Maps ◽  
Mountain Building ◽  
Species Extinction ◽  
Geologic Time ◽  
The Earth ◽  
The Relationship

This book is a scientific, historical, and philosophical narrative for general readers that explores the relationship between humans and the Earth and the geologic principles of time, plate tectonics, and change in life forms. Illustrated with striking historical maps, figures, and pictures, this comprehensive work can be read as a thrilling biography of the Earth itself, including narrative sections on the lives of pioneering geologists; the reality and sublimity of geologic time; the birth, destruction, and rebirth of the planet and its atmosphere over repeated cycles spanning some 4-plus billion years; the science underlying both mountain building and oceanic evolution; the influence of climate change and species extinction on the development of the Earth; and the interplay between not only how Earth has influenced life but how life, in turn, has distinctly shaped our planet.

scholarly journals A View to Anorthosites

2021 ◽  
Author(s):  
Homayoon Mohammadiha
Keyword(s):  
Plate Tectonics ◽  
Early Time ◽  
The Moon ◽  
Planetary Evolution ◽  
Planetary Geology ◽  
Lunar Science ◽  
The Earth ◽  
Celestial Bodies ◽  
The Subject ◽  
Impact Hypothesis

It seems anorthosites are by far interested by geologists because they give us great information about Earth history and how it was evolved in planetary geology. Planetary geology is subject the geology of the celestial bodies such as the planets and their moons, asteroids, comets, and meteorites. It is nearly abundant in the moon. So, it seems studying of these rocks give us good information about planetary evolution and the own early time conditions. Anorthosites can be divided into few types on earth such as: Archean-age (between 4,000 to 2,500 million years ago) anorthosites, Proterozoic (2.5 billion years ago) anorthosite (also known as massif or massif-type anorthosite) – the most abundant type of anorthosite on Earth, Anorthosite xenoliths in other rocks (often granites, kimberlites, or basalts). Furthermore, Lunar anorthosites constitute the light-colored areas of the Moon’s surface and have been the subject of much research. According to the Giant-impact hypothesis the moon and earth were both originated from ejecta of a collision between the proto-Earth and a Mars-sized planetesimal, approximately 4.5 billion years ago. The geology of the Moon (lunar science) is different from Earth. The Moon has a lower gravity and it got cooled faster due to its small size. Also, it has no plate tectonics and due to lack of a true atmosphere it has no erosion and weathering alike the earth. However, Eric A.K. Middlemost believed the astrogeology will help petrologist to make better petrogenic models to understand the magma changing process despite some terms geological differences among the Earth and other extraterrestrial bodies like the Moon. So, it seems that these future studies will clarify new facts about planet formation in planetary and earth, too.

Life on the Earth

2021 ◽  
pp. 137-162
Author(s):  
Elisabeth Ervin-Blankenheim
Keyword(s):  
Plate Tectonics ◽  
Charles Darwin ◽  
Life Forms ◽  
Theory Of Evolution ◽  
Geologic Time ◽  
Long Span ◽  
Foot Structure ◽  
Evolutionary Thought ◽  
History Of ◽  
Extinction Events

Change in life forms over the long span of the Earth’s history, and the theory of evolution are discussed in chapter 7. Along with the tenets of geologic time (chapters 3 and 4) and plate tectonics (chapters 5 and 6), evolution encompasses another foundational idea in geology. This chapter examines the history of evolutionary thought and theory, starting with Charles Darwin and his work on natural selection. The historic “Bone Wars” that occurred with the discovery of the dinosaur fossils is an example of how fossils are used and sometimes misused to unravel the evolution of a significant branch in the Earth’s history of life. So too, the story of horses and their ancestors is portrayed in the Cenozoic era, as early equine ancestor species responded in their body size and tooth and foot structure to changes in climate and the opening of grasslands. The number and variety of life forms waxes and wanes over geologic time, through evolution and sometimes extinction events, only to re-emerge over eons, eras, periods, and epochs, leading to pulses of biodiversity in the fossil record. The theory of evolution was forged after the work by Darwin and others by later developments in molecular biology and DNA research which support modern evolutionary theory.

Galactic Center Two

2017 ◽  
Author(s):  
George Slusser
Keyword(s):  
Galactic Center ◽  
Life Forms ◽  
Machine Intelligence ◽  
The Moon ◽  
Clear Cut ◽  
Organic Life

This chapter examines Nigel Walmsley's space odyssey in In the Ocean of Night and Across the Sea of Suns, which span the dates from 1999 to 2061. By the end of the first novel, Nigel has discovered a cosmic struggle between machine intelligence and organic life that will soon engulf Earth. Through several contacts with alien artifacts and entities that had come to Earth in both prehistoric and recent times, he predicts the coming of the machines. In Across the Sea of Suns, Nigel does battle with the machines with the help of organic life forms he finds on the moon of a planet in distant Epsilon Eridani. In the process, he reaffirms what he had earlier discovered on Earth: that, in the evolutionary sense, the boundary between machine and organism is not clear cut. The stamp of Arthur C. Clarke's Space Odyssey is clearly on both In the Ocean of Night and Across the Sea of Suns. The chapter analyzes the two novels in order to understand how Gregory Benford launched his space epic.

John Tuzo Wilson: a Canadian who revolutionized Earth Sciences

2014 ◽  
Vol 51 (3) ◽  
pp. v-viii ◽  
Author(s):  
Ali Polat
Keyword(s):  
Earth Sciences ◽  
Plate Tectonics ◽  
50Th Anniversary ◽  
Continental Drift ◽  
Special Issue ◽  
The Past ◽  
The Earth ◽  
The World ◽  
Wilson Cycle ◽  
Geologic Record

John Tuzo Wilson (1908–1993) was one of the greatest Canadian scientists of the 20th century. His contributions to Earth Sciences, leading the formulation of the theory of plate tectonics, have revolutionized our understanding of how the planet Earth works and evolved over the past 4 billion years. This 50th anniversary special issue of the Canadian Journal of Earth Sciences is dedicated in honour of John Tuzo Wilson, who inspired tens of thousands of students all around the world to study the Earth. This special issue contains 12 papers dealing with various aspects of the “Wilson Cycle” in the geologic record, plate tectonics, mantle plumes, and how John Tuzo Wilson accepted “continental drift” and formulated the theory of plate tectonics. The contributions have mostly been made by geoscientists who directly or indirectly associated with John Tuzo Wilson and have contributed significantly to the plate tectonics paradigm.

The motion of a lunar orbiter

1966 ◽  
Vol 25 ◽  
pp. 373
Author(s):  
Y. Kozai
Keyword(s):  
Degrees Of Freedom ◽  
Dimensional Space ◽  
Artificial Satellite ◽  
Equations Of Motion ◽  
Triaxial Ellipsoid ◽  
The Moon ◽  
Secular Motion ◽  
The Earth ◽  
Close Satellite ◽  
The Mean

The motion of an artificial satellite around the Moon is much more complicated than that around the Earth, since the shape of the Moon is a triaxial ellipsoid and the effect of the Earth on the motion is very important even for a very close satellite.The differential equations of motion of the satellite are written in canonical form of three degrees of freedom with time depending Hamiltonian. By eliminating short-periodic terms depending on the mean longitude of the satellite and by assuming that the Earth is moving on the lunar equator, however, the equations are reduced to those of two degrees of freedom with an energy integral.Since the mean motion of the Earth around the Moon is more rapid than the secular motion of the argument of pericentre of the satellite by a factor of one order, the terms depending on the longitude of the Earth can be eliminated, and the degree of freedom is reduced to one.Then the motion can be discussed by drawing equi-energy curves in two-dimensional space. According to these figures satellites with high inclination have large possibilities of falling down to the lunar surface even if the initial eccentricities are very small.The principal properties of the motion are not changed even if plausible values ofJ3andJ4of the Moon are included.This paper has been published in Publ. astr. Soc.Japan15, 301, 1963.

Formation of Lunar Craters and Bright Rays as a Result of Meteorite Impacts

1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten
Keyword(s):  
Explosive Charge ◽  
The Moon ◽  
Meteorite Impacts ◽  
The Earth ◽  
Lunar Craters ◽  
The Impact

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.

The Origin of the Moon

1962 ◽  
Vol 14 ◽  
pp. 149-155 ◽  
Author(s):  
E. L. Ruskol
Keyword(s):  
Chemical Composition ◽  
Solar System ◽  
The Moon ◽  
The Earth ◽  
The Difference ◽  
Origin Of The Moon

The difference between average densities of the Moon and Earth was interpreted in the preceding report by Professor H. Urey as indicating a difference in their chemical composition. Therefore, Urey assumes the Moon's formation to have taken place far away from the Earth, under conditions differing substantially from the conditions of Earth's formation. In such a case, the Earth should have captured the Moon. As is admitted by Professor Urey himself, such a capture is a very improbable event. In addition, an assumption that the “lunar” dimensions were representative of protoplanetary bodies in the entire solar system encounters great difficulties.

The Origin of the Moon and its Relationship to the Origin of the Solar System

1962 ◽  
Vol 14 ◽  
pp. 133-148 ◽  
Author(s):  
Harold C. Urey
Keyword(s):  
Solar System ◽  
The Moon ◽  
The Past ◽  
The Earth ◽  
Short Period ◽  
Origin Of The Moon

During the last 10 years, the writer has presented evidence indicating that the Moon was captured by the Earth and that the large collisions with its surface occurred within a surprisingly short period of time. These observations have been a continuous preoccupation during the past years and some explanation that seemed physically possible and reasonably probable has been sought.

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