One of several periods of relatively low temperature during the last million years that lowered sea level by at least 100 meters.

Study for the IB Marine Science Standard Level Exam. Prepare with interactive quizzes and in-depth explanations. Use our resources to excel in your marine science knowledge!

Multiple Choice

One of several periods of relatively low temperature during the last million years that lowered sea level by at least 100 meters.

During these times, global temperatures dropped and large continental ice sheets expanded, locking up a lot of Earth’s water on land. That removal of water from the oceans caused sea level to fall by about 100 meters or more at the peaks of glacial periods. The last million years have seen several such cycles, so what’s being described is an ice age.

The other options aren’t related to climate-driven sea-level changes: an island arc is a volcanic chain, an ocean basin is a broad seafloor region, and a submarine canyon is an undersea channel carved by currents.

One of several periods of relatively low temperature during the last million years that lowered sea level by at least 100 meters.

Study for the IB Marine Science Standard Level Exam. Prepare with interactive quizzes and in-depth explanations. Use our resources to excel in your marine science knowledge!

One of several periods of relatively low temperature during the last million years that lowered sea level by at least 100 meters.

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