Get planet earth reviews and study guides here. Learn about planet earth or brush up on your skills. Thorough explanations and practice examples will help you review earth science.

Study Guides

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  • 1.

    Planet Earth Help

    Introduction to Planet Earth From space, our world looks like a brilliant blue marble. Sometimes called the “blue planet,” the Earth is over 70% water and is unique in our solar system. Clouds, fires, hurricanes, tornadoes, and other natural characters ...

    Source: McGraw-Hill Professional
  • 2.

    Earth's Formation Help

    Earth’s Formation In 1755, Immanuel Kant offered the idea that the solar system was formed from a rotating cloud of gas and thin dust. In the years since then this idea became known as the nebular hypothesis . The clouds that ...

    Source: McGraw-Hill Professional
  • 3.

    Planet Earth Practice Test

    If necessary, review: Planet Earth Help Earth's Formation Help ...

    Source: McGraw-Hill Professional
  • 4.

    Gravity, Biosphere, Atmosphere, Hydrosphere, and Lithosphere Help

    Gravity If the Earth is spinning, then what force keeps us and everything else in place? Gravity . In 1666, English scientist, Sir Isaac Newton (the guy who had an apple fall off a tree and land on his ...

    Source: McGraw-Hill Professional
  • 5.

    Earth's Crust Help

    Introduction to the Earth's Crust The Earth’s crust is the hard, outermost covering of the Earth. This is the layer exposed to weathering like wind, rain, freezing snow, hurricanes, tornadoes, earthquakes, meteor impacts, ...

    Source: McGraw-Hill Professional
  • 6.

    Earth's Mantle Help

    Earth's Mantle The mantle is the next layer down in the Earth’s crust. It is located just below the lithosphere. The mantle makes up 70% of the Earth’s mass. It is estimated to be about 2900km thick. The mantle is not the same all ...

    Source: McGraw-Hill Professional
  • 7.

    Earth's Core Help

    Introduction to the Earth's Core Found beneath the mantle is the very center of the Earth. It is made up mostly of iron with a smattering of nickel and other elements. Under extreme pressure, the core makes up about 30% of the total mass of ...

    Source: McGraw-Hill Professional
  • 8.

    Water Cycles Study Guide

    Introduction Life as we know it cannot exist without water. Though other crucial molecules are needed for living things, one might say that water is the most important molecule of all. Where is water found? How does the water cycle work?

    Source: LearningExpress, LLC
  • 9.

    Earth Science and Evolution Study Guide

    Introduction Earth today is the product of 4.5 billion years of changes. Life is an important player in connecting the earth's surface reservoirs of atmosphere, ocean, and soil. Here we look at questions that surround the history of the oceans, continents, and, in ...

    Source: LearningExpress, LLC
  • 10.

    Humans as a Geological Force Study Guide

    Introduction Unlike other species, humans deploy vast arrays of chemical processes outside their biological bodies, via factories, residences, and forms of transportation. Chemical inputs and outputs from these have created a new kind of force within the systems ...

    Source: LearningExpress, LLC
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