Earth's History

Front

A __________ is the remains of a once-living organism found in layers of rock, ice, or amber.

Back

Fossil

Front

______________________ is the process in which a radioactive isotope tends to break down into a stable isotope.

Back

Radioactive Decay

Front

The time required for half the quantity of a radioactive material to decay is its _____________

Back

Half-Life

Front

TRUE OR FALSE Scientists use Relative dating to determine the actual age of an event or object in years

Back

False

Front

The fossil evidence supports which hypothesis about the extinction of the older reptile species? Options: The older reptile species went extinct because sea levels rose and flooded its habitat, The older reptile species went extinct because a predator was introduced into the environment, The older reptile species went extinct because it could not compete with the younger reptile species, The older reptile species went extinct because a volcanic eruption caused the environment to change.

Back

The older reptile species went extinct because a volcanic eruption caused the environment to change.

Front

Which statement explains how ancient coral reef fossils can be found high in the mountains far from sea? A huge tidal wave pushed marine life up into the mountain, Prehistoric man carried fish into the mountains from the sea, Fish were thrown into the mountains by a tremendous volcanic explosion, Land that was uplifted to form the mountains was once covered by the sea.

Back

Land that was uplifted to form the mountains was once covered by the sea

Front

An examination of the Cliffs of Dover from top to bottom would show a change from

Back

Younger fossils to older fossils

Front

Based on observations, the paleontologist concluded that the layers had been undisturbed by geological activity. Which layer should have the oldest fossils? Options: Layer 8, Layer 6, Layer 4, Layer 2

Back

Layer 2

Front

Jacob has one older brother and one younger sister. He wants to explain relative dating to them using their ages as an example. Which of the following arrangements would show the concept of relative dating? Options: Forming a line in the order of age, Forming a line in the order of height, Forming a line in the order of weight, Forming a line in the order of birth month

Back

Forming a line in the order of age

Front

How do scientists use fossils to determine the relative ages of rock layers?

Back

By comparing fossils in many different rock layers.