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The sun and Earths interior heat
What are the two fundamental sources of energy that drive the Earths system
The time required for half of the nuclei in a radioactive sample of matter to decay is called?
Consensus of like minded people
The scientific method depends on what in order to function properly.
60,000 years old
The half life of carbon 14 is roughly 5,730 years. This radioactive element is used to date fossils and rocks that are younger than
3.9 billion years ago
The radioactive isotope dating of marine sedimentary rock from the surface of the Earth tells us that oceans were present.
First billion years of Earth's history
The conversion of the homogeneous Proto-Earth to the highly differentiated Earth of today occurred in the
late Paleozoic time period
The great southern hemisphere glaciations that affected parts of Africa, South America, India, Australia, and Antarctica occurred.
Growing evidence indicates that very large volumes of water were delivered to the early Earth from
The desert pavement
is formed by deflation and sheet wash removed from fine, resized materials leaving coarse, weathered rock fragments concentrated at the surface.
, surface ocean currents are deflected to the right of their path of motion in the Northern Hemisphere because of the
Antarctic Continental Shelf
Most of the world's ocean is filled with bottom water originating on the
, polar jet streams are deflected northward into Canada, sub-tropical jet streams are forced from the Caribbean Sea into continental North America, a large body of warm water is moved from the north of Australia into the eastern Pacific Ocean, and the Peru Current is greatly diminished or destroyed.
With the development of a strong El Nino condition in the southeastern Pacific Ocean.
Several islands and hills in the Boston area are elliptical and elongated in a north-south direction. Till is common in the area. The hills and islands are most likely
The ultimate level to which a land surface may be eroded in extreme old age, given time and tectonic stability is
Life is possible on earth primarily because this shields the surface from harmful radiation
circulations in the earth's atmosphere
are fundamentally caused by temperature contrasts between different locations
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