Check-In Review 1

Front

What percent of the total energy used in the United States in 2009 came from fossil fuels?

Back

83% of the total energy used in the United States in 2009 came from fossil fuels.

Front

What can be concluded about the distribution of water on Earth's surface?

Back

Most of the water available on Earth is not drinkable.

Front

Which types of wetlands are known as the 'Nurseries of the Sea'?

Back

Estuaries are known as the 'Nurseries of the Sea'.

Front

What is the best method for determining the exact age of a rock sample?

Back

Radiometric (radioactive) dating is the best method for determining the exact age of a rock sample.

Front

How does increased levels of CO2 affect Earth's global temperature?

Back

Increased levels of CO2 increase Earth's temperatures.

Front

What is the definition of fossil fuels?

Back

Fossil fuels are natural substances formed from the remains of ancient plants and animals, used as energy sources.

Front

What is groundwater?

Back

Groundwater is water that is stored beneath the Earth's surface in soil and rock formations.

Front

What is the law of superposition?

Back

The law of superposition states that in undisturbed layers of rock, the oldest rocks are at the bottom and the youngest are at the top.

Front

What are estuaries?

Back

Estuaries are coastal areas where freshwater from rivers meets and mixes with saltwater from the ocean.

Front

What is radiometric dating?

Back

Radiometric dating is a method used to determine the age of rocks and fossils by measuring the decay of radioactive isotopes.