Geologic Time Review

Front

What is Radiocarbon dating?

Back

A method used to determine the absolute age of fossils by measuring the decay of carbon-14 isotopes.

Front

What is the Law of Superposition?

Back

A principle stating that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest are at the top.

Front

What evidence do trilobite fossils provide about Earth's history?

Back

They show that Earth has changed over time, as they are found in both rocky and marine environments.

Front

What does weathering mean in geology?

Back

The process of breaking down rocks and minerals through natural forces like wind, water, and temperature changes.

Front

What is erosion?

Back

The process by which soil and rock are removed from one location and transported to another, often by water, wind, or ice.

Front

Why is the study of fossils important?

Back

Fossils provide evidence of past life and help scientists understand how organisms and environments have changed over time.

Front

What is the significance of sedimentary rock layers?

Back

They record the history of Earth, including changes in environment and climate over time.

Front

What can the presence of fish fossils in a desert indicate?

Back

It suggests that the area was once a lake or body of water that dried up due to geological changes.

Front

What is uranium-lead dating?

Back

A method used to determine the absolute age of rocks by measuring the decay of uranium isotopes into lead.

Front

How do scientists use fossils to understand Earth's past?

Back

Fossils help scientists reconstruct ancient environments and understand the evolution of life.