Plate Tectonics

What structure is the arrow pointing to?

• Subduction zone

• Stratovolcano

• Mid-ocean ridge

• Pangea

Where would you find the oldest rocks on the ocean floor?

• near the mid-ocean ridge

• near the trench

What process creates new crust from magma?

• sea-floor spreading
• subduction
• weathering
• erosion

What is the underlying force that drives plate tectonics?

• Ocean tides

• Volcanic eruptions

• The rock cycle

• Convention currents

What evidence did Alfred Wegener use to support his theory of continential drift?

• Fossil discoveries

• The Himalayan Mountains

• Ancient maps of the world

• Charts of seismic activity

Which type of boundary forms a mid-ocean ridge?

• transform

• divergent

• convergent

What makes the plates move?

• Conduction in the mantle

• Convection in the mantle

What are the puzzle pieces of the Earth's surface called?

• Tectonic plates
• Puzzles
• Earthquakes

Which of the following is true of Earth's landmasses?

• They are the upper part of the crust

• They are made of a single tectonic plate

• They are the densest part of the crust

• They were formed by earthquakes

What is one piece of evidence for sea-floor spreading?

• magnetic stripes on the ocean floor
• island arcs caused by subduction
• older rocks are closest to the mid-ocean ridge
• younger rocks are near the trenches