Dynamic Earth - Continental Drift and Seafloor Spreading

Mr. Shirey is ...

• the GOAT

• a bird nerd

• probably pretty sleepy

• hungry... he's always hungry

• CRINGE

Where can volcanoes form?

• convergent plate boundaries
• divergent plate boundaries
• over hot spots in the middle of plates
• all of the above

If you wanted to avoid earthquakes, which would be the best location to choose. Use the map.

• 1 - West Coast
• 2 - the Great Lakes region
• 3 - the largest island in Hawaii
• 4 - southern Alaska

The map shows where glaciers existed 250 million years ago. Which explanation is supported by the data in the map?

• Glaciers formed in the locations shown on the map because of a change in climate that caused the southern hemisphere to experience an ice age.
• Glaciers at one time covered most of the continents in the world, but the glaciers melted and the areas on the map are places where glaciers still remain.
• There is evidence of glaciers in the areas identified on the map because the current climate in those areas still supports glacier formation.
• There is evidence of glaciers in the areas identified on the map because the continents were once located near a polar region, but then over time the continents moved apart.

The presence of the same _______________ on several continents supports the hypothesis of continental drift.

• A) fossils
• B) rocks
• C) neither a or b
• D) both a and b

A lack of explanation for continental drift prevented many scientists from accepting that a single supercontinent called _________________ once existed.

• Glomar
• Pangaea
• Wegener
• Glossopteris

The youngest rocks on the ocean floor are located________________.

• near continents
• at mid-ocean ridges
• far from mid-ocean ridges
• near Asia

Which of the following best explains the age of the oceanic crust and ocean-floor features?

• seafloor spreading
• continental drift
• subduction
• crystallization

Looking at the figure that shows the world wide earthquake distribution, the white lines represent plate boundaries. Which statement is true?

• Earthquakes ALWAYS occur on plate boundaries.
• Earthquakes FREQUENTLY occur along plate boundaries.
• Earthquakes RARELY occur along plate boundaries.
• Earthquakes NEVER occur along plate boundaries.

_________________ are formed when two continental plates collide.

• Volcanoes
• Strike-slip
• Mountain Ranges
• Rift Valley