The Big Bang occurred about

By analyzing the light that a star emits, astronomers can determine

By understanding how natural forces affect the environment, Earth scientists can

Circumpolar stars in the Northern Hemisphere appear to circle

A community of organisms and their biotic environment is called a

A constellation's change in position over seeral hours is caused by

A contour interval is the

Convection, ridge push, and slab pull work together to produce

The Coriolis effect provides evidence that

Continental polar, maritime polar, continental tropical, and maritime tropical are types of

Different colors are the result of

Doppler radar and satellite images provide information to create

During the main sequence stage, how is energy generated in a star's core?

The early oceans became salty when

Each of Earth's standard time zones covers about

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