NC Check-In Flashcardizz Earth Science

Front

How would a large increase in the salinity of an estuary most likely affect the ecosystem of the estuary?

Back

The number of salt-tolerant organisms would increase, and the number of salt-intolerant organisms would decrease.

Front

What indicates the water in a lake is not safe for drinking?

Back

High turbidity levels in the lake

Front

A geologist identifies the identical index fossils in rock layers from two different areas. What conclusion is best supported by this discovery?

Back

The two rock layers were deposited at approximately the same time.

Front

What supports the theory that some mountains were once at the bottom of an ocean?

Back

Fossils of marine organisms are found on the tops of some mountains.

Front

Why is all of the Earth’s freshwater not available for human use?

Back

Most of earth's freshwater is frozen water

Front

How can upwellings improve fishing for ocean fishermen?

Back

They bring nutrients from the cold, deep ocean waters.

Front

If a lake has excess levels of phosphates and nitrates in its water, what will most likely result?

Back

The growth of algae in the lake will increase.

Front

Which is the most accurate method scientists use to predict the age of Earth?

Back

radioactive dating of rocks

Front

Which is the best evidence for evolution?

• new rock layers containing fossils of simple organisms
• new rock layers containing fossils unlike existing organisms
• old rock layers containing fossils unlike existing organisms
• old rock layers containing fossils of complex organisms

Back

old rock layers containing fossils unlike existing organisms

Front

Why did mammals become dominant after the mass extinction of the dinosaurs?

Back

They had traits that helped them adapt to environmental changes.