Lesson 1 & 2 Continental Drift & Seafloor Spreading

The solid rock of the cliff in this photograph is part of a continent. What is the relationship between the continent and Earth’s plates?

• The continent is part of plate.

• The continent is next to but is not part of a plate.

• The continent is floating on top of a layer of water that is above a plate.

• The continent is directly on top of a plate but is not part

  of the plate.

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Which is a better model of the Earth, world map or a globe?

• A world map is a better model of the Earth than a globe.

• A globe is a better model of the Earth than a world map.

• Whether a world map or a globe is better depends on how they will be used.

• Whether a world map or a globe is better depends on who will be using them.

What of the following is true about Earth’s plates?

• Earth’s plates are separated by oceans.

• Earth’s plates are piled on top of one another within the Earth.

• Earth’s plates fit closely together with the edge of the plates touching each other.

• Earth’s plates are surrounded by melted rock and do not touch each other.

What of the following is true about the size of Earth’s plates?

• Some plates are as big as an entire ocean.

• Some plates are as big as the entire Earth.

• No plate is bigger than a football field.

• No plate is bigger than a mountain range.

How do patterns in earthquake data compare to the patterns in volcanic data? Select ALL that are true.

• The shallow parts of the ocean had the most earthquakes and volcanoes.

• Earthquakes and volcanoes overlap in some places.

• Some islands have both volcanoes and earthquakes.

• Earthquakes are far more common than volcanies and are especially frequent where the larger numbers of volcanoes.

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What patterns did you see in elevation where we saw high earthquake and volcanic activity? 

• Earthquakes and volcanoes often occur on or near areas of high elevation - on land and in the ocean.

• Earthquakes and volcanoes mostly occur on land.

• Volcanoes occur in high elevation areas and earthquakes occur in low elevation areas.

• There doesn’t seem to be a pattern that relates volcanoes and earthquakes to elevation.

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Knowing that earthquake and volcanic activity help us to see where the edges of plates are located, what can we conclude about plates based on the patterns we have seen so far?  Select ALL that apply.

• There are many plates of different shapes and sizes that make up the Earth’s surface.

• Continents do not define plates - both continent and ocean can be a part of a plate.

• The plates are defined by the continents. The continent boundaries are the plate boundaries.

• There are many wide gaps or spaces between the plates.

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With which statements below do you agree? You may select more than one.

• There is a worldwide pattern of earthquakes and volcanoes.

• The Earth's surface is changing in relatively small ways due to the activity of volcanoes and earthquakes that occur at the boundaries of plates.

• The Earth’s surface is made of large, flat pieces of varying sizes called plates.

• The Earth stopped changing millions of years ago.

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Who first proposed the idea of continental drift?

• Albert Einstein

• Alfred Wegener

• Rosalind Franklin

• Gregory Mendel

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Which of the following choices did Wegener give as evidence for continental drift?

• (A) Fit of continents, rock sequences, glacial evidence

• (B) Identical fossil species on different continents (both plant and animal), Antarctica climate changes

• (C) Sea-floor spreading, mid-ocean ridge and trenches

• A and B only

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