Earth History and Surface Evidence Test Review

Front

What is radioactive decay?

Back

Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation, resulting in the transformation of the element into a different element or isotope.

Front

What is a half-life?

Back

A half-life is the time required for half of the radioactive atoms in a sample to decay into a different element or isotope.

Front

How many half-lives does it take for 100% of a radioactive substance to decay?

Back

It takes an infinite number of half-lives for a radioactive substance to decay completely, as it approaches zero but never actually reaches it.

Front

What is the significance of the Theia impact?

Back

The Theia impact is significant because it is believed to have led to the formation of the Moon and altered Earth's composition and rotation.

Front

What is erosion?

Back

Erosion is the geological process where soil and rock are removed from the Earth's surface by natural forces such as wind or water.

Front

What surface feature is created by an asteroid impact?

Back

A large crater is typically created by an asteroid impact.

Front

What is a crater chain?

Back

A crater chain is a series of craters formed by the impact of multiple smaller bodies, often seen on the Moon.

Front

What is isostasy?

Back

Isostasy is the state of gravitational equilibrium between the Earth's lithosphere and asthenosphere, affecting land elevation.

Front

What is the difference between a delta and a moraine?

Back

A delta is a landform created by sediment deposition at the mouth of a river, while a moraine is an accumulation of debris deposited by a glacier.

Front

What is the current distance of the Moon from Earth?

Back

The Moon is currently about 239,000 miles away from Earth.