CLMS Unit 6B Test Review

Front

What is the significance of coal beds found in Antarctica?

Back

Coal beds indicate that Antarctica was once located at a tropical latitude, where lush vegetation thrived.

Front

What geological evidence do scientists study to understand changes in sea level over time?

Back

Scientists study sedimentary layers to construct graphs of sea level changes.

Front

How can fossils at different points in a geological timeline be compared?

Back

Fossils can be compared based on their age, size, commonality, and complexity.

Front

What is a half-life in the context of radioactive elements?

Back

A half-life is the time required for half of the atoms of a radioactive element to decay.

Front

If a fossil contains 1/32 of the original amount of carbon-14, how many half-lives have passed?

Back

5 half-lives have passed.

Front

What phenomenon occurs when oxygen from photosynthesis reacts with iron in the ocean?

Back

The biosphere changed the lithosphere by forming red layers of oxidized iron in sedimentary rock.

Front

What is the role of the biosphere in geological changes?

Back

The biosphere can influence the lithosphere through processes like photosynthesis and sediment formation.

Front

What type of rock is primarily studied to understand Earth's history?

Back

Sedimentary rocks are primarily studied because they contain fossils and evidence of past environments.

Front

What does the presence of red layers in sedimentary rock indicate about Earth's atmosphere?

Back

The presence of red layers indicates that oxygen was abundant in the atmosphere due to photosynthesis.

Front

How do scientists determine the age of fossils?

Back

Scientists use methods like radiometric dating, which involves measuring the decay of radioactive isotopes.