Module 1 Dynamic Earth

Front

The early development of the theory of plate tectonics was supported by which of these observations? matching fossils on the continents of Africa and South America, glacier deposits far from existing continental glaciers, thick sediment layers at the mouths of rivers, sudden volcanic activity of long-dormant volcanoes

Back

matching fossils on the continents of Africa and South America

Front

According to the table, as the magnitude of earthquakes increases, the distance that tremors will be felt ____.

Back

increases

Front

A geologist checks her seismometer for activity after an earthquake that occurs on the other side of Earth. The instrument records P-waves, but not S-waves. What statement explains why S-waves are not recorded?

Back

The S-waves were stopped by a liquid interior layer.

Front

Based on the diagram, which process explains why less dense, hot magma rises to the surface to displace more dense, cooler magma? Options: conduction, diffusion, radiation, convection

Back

convection

Front

This map shows the continents as they appear on Earth's surface today. It would be correct to say that in another 50 years the continents will ___

Back

be in almost the same positions as they are in today.

Front

The best evidence that the continents were once connected is that they have matching ___

Back

rock types, fossils, and coastlines.

Front

The Mid-Atlantic Ridge exists between the African and South American geologic plates. Which process most often occurs at the Mid-Atlantic Ridge?

Back

seafloor spreading

Front

Which area of the diagram shows the subduction zone? Options: 1, 2, 3, 4

Back

3

Front

The following diagram shows a cross-section of the mid-Atlantic Ridge. Which area is likely the oldest crust?

Back

1

Front

Which of the following is the best evidence that Earth's continents were once in vastly different positions than they are today? Penguins are found only in the Southern Hemisphere. Fossils of tropical plants are found in Antarctica. Volcanoes encircle the Pacific Ocean. Major rivers form deltas from continental erosion.

Back

Fossils of tropical plants are found in Antarctica.