The earth and its people

Twenty years after the first global environment conference, the UN sought to help Governments rethink economic development and find ways to halt the destruction of irreplaceable natural resources and pollution of the planet.

The earth and its people

NASA Earth, our home, is the third planet from the sun. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the fifth largest of the planets in the solar system — smaller than the four gas giants, JupiterSaturnUranus and Neptunebut larger than the three other rocky planets, MercuryMars and Venus.

Earth has a diameter of roughly 8, miles 13, kilometersand is round because gravity pulls matter into a ball, although it is not perfectly round, instead being more of an "oblate spheroid" whose spin causes it to be squashed at its poles and swollen at the equator.

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While scientists have been studying our planet for centuries, much has been learned in recent decades by studying pictures of Earth from space.

Orbital characteristics Earth spins on an imaginary line called an axis that runs from the North Pole to the South Pole, while also orbiting the sun.

It takes Earth This means the northern and southern hemispheres will sometimes point toward or away from the sun depending on the time of year, varying the amount of light they receive and causing the seasons. Earth happens to lie within the so-called "Goldilocks zone" around its star, where temperatures are just right to maintain liquid water on its surface.

Average distance from the sun: As the nebula collapsed because of its gravity, it spun faster and flattened into a disk. Most of the material was pulled toward the center to form the sun. Other particles within the disk collided and stuck together to form ever-larger bodies, including Earth.

The solar wind from the sun was so powerful that it swept away most of the lighter elements, such as hydrogen and helium, from the innermost worlds, rendering Earth and its siblings into small, rocky planets. Scientists think Earth started off as a waterless mass of rock.

The history of Earth is divided into four eons — starting with the earliest, these are the Hadean, Archean, Proterozoic and Phanerozoic. The first three eons, which together lasted nearly 4 billion years, are together known as the Precambrian.

Evidence for life has been found in the Archaean about 3. The Phanerozoic is divided into three eras — starting with the earliest, these are the Paleozoic, Mesozoic, and Cenozoic.

The earth and its people

The Paleozoic Era saw the development of many kinds of animals and plants in the seas and on land, the Mesozoic Era was the age of dinosaurs, and the Cenozoic Era we are in currently is the age of mammals.

Most of the fossils seen in Paleozoic rocks are invertebrate animals lacking backbones, such as corals, mollusks and trilobites. Fish are first found about million years ago, while amphibians appear roughly million years ago. By million years ago, large forests and swamps covered the land, and the earliest fossils of reptiles appear during this period as well.

The Mesozoic saw the ascendence of dinosaursalthough mammals also appear in the fossil record about million years ago.The dominant people in the earliest chinese dynasty for which we have written record.

Ancestor worchip, divination by means of oracle bones, and the use of bronze vessels for ritual purposes were major elements of Shang culture. The Earth and Its Peoples: A Global History, Volume II (Available Titles CourseMate) 5th edition by Bulliet, Richard, Crossley, Pamela, Headrick, Daniel, Hirsch () Paperback.

The Earth and Its People - Cover1 Table of Contents for the Digital Edition of The Earth and Its People The Earth and Its People - Cover1 The Earth and Its People - 2. The Earth and Its Peoples A Global History THIRD EDITION Richard W.

Planet Earth: Facts About Its Orbit, Atmosphere & Size

Bulliet Columbia University Pamela Kyle Crossley Dartmouth College Daniel R. . Physical Geography: Earth 1 Environments and Systems Physical geography investigates and seeks to explain the spatial aspects, functions, and characteristics of Earth’s world in the study of people, places, and environments.

Its sub-ject matter is the Earth’s surface and the processes that shape it, the relationships between people and. The Earth and Its Peoples: A Global History, Volume B (Available Titles CourseM See more like this The Earth and Its Peoples (Available Titles CourseMate) by Crossley, Pamela, He Pre-Owned.

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