What do scientists believe is the force behind the plate tectonics theory?
|A)||the Sun's gravity|
|B)||the movement of the planets|
|C)||gravity slab pull|
How do scientists use sound waves to figure out the shape of the ocean floor?
|A)||The longer it takes a sound wave to return to the ship, the more shallow the water is.|
|B)||The longer it takes a sound wave to return to the ship, the colder the water is.|
|C)||The longer it takes a sound wave to return to the ship, the deeper the water is.|
|D)||The less time it takes a sound wave to return to the ship, the deeper the water is.|
How can Earth's plates move?
|A)||They only can move toward each other.|
|B)||They only converge or diverge.|
|C)||They can collide, pull apart, or slide against each other.|
|D)||They only collide or slide along each other.|
Why was the discovery of no rocks older than 2 billion years old on the ocean floor so important?
|A)||This evidence proved that new seafloor features are constantly being added due to seafloor spreading.|
|B)||This evidence proved that the rocks on the seafloor were older than rocks on continents.|
|C)||This evidence proved that new seafloor features are constantly being added due to reversals of Earth's magnetic field.|
|D)||This evidence proved that new seafloor features are constantly being added due to continental drift.|
What is Pangaea?
|A)||the largest fault found on Earth|
|B)||Earth's inner core|
|C)||the large landmass that all continents are currently forming|
|D)||the large landmass in which all continents once were connected|
How do scientists explain the formation of underwater mountain ranges?
What are strike-slip faults?
|A)||a boundary where rocks on opposite sides of the fault move in opposite or the same directions at different rates|
|B)||a boundary where rocks in the fault never move|
|C)||a boundary where rocks move in the same directions at the same rate|
|D)||a boundary where rocks on the same side of the fault move in the same direction, but at different rates|
How can crust disappear at the edge of a boundary?
|A)||Gravity is pulling it down.|
|B)||The other edge of the boundary is being pulled into Earth's core.|
|C)||It is too dense and is sinking into Earth.|
|D)||because new crust is being added to the other edge of the boundary|
What is a transform boundary?
|A)||A transform boundary is when two plates pull away from each other.|
|B)||A transform boundary is when two plates slide past one another.|
|C)||A transform boundary is when two plates move toward each other.|
|D)||A transform boundary is when two plates collide.|
Do two colliding continental plates always cause volcanoes?
|A)||Yes, subduction always occurs when continental plates collide.|
|B)||No, usually no subduction occurs when continental plates collide.|
|C)||No, earthquakes always occur when two continental plates collide.|
|D)||Yes, subduction always occurs when oceanic plates collide.|
What happens to rock around a subducting slab?
|A)||It combines with the other rock.|
|B)||It goes over the other plate.|
|C)||It goes under the other plate.|
|D)||It disappears from Earth.|
What does plate tectonics cause?
|B)||all answers are correct|
|C)||forms ocean basins|
What evidence proved that South America, Africa, India, and Australia were once covered by glaciers?
|B)||enormous valleys formed by glaciers|
|C)||leftover portions of glaciers|
|D)||glacial deposits and rock surfaces scarred by glaciers|
Who first proposed the theory of continental drift?
What is the continental drift theory?
|A)||the belief that continents have quickly moved apart to their current locations on Earth|
|B)||the belief that continents have moved slowly apart to their current locations on Earth|
|C)||the belief that continents have always been located at their current locations on Earth|
|D)||the belief that continents are moving slowly together from their current locations on Earth|
What clue supported the continental drift theory?
|A)||a puzzle-like fit of all the continents|
|B)||all answers are correct|
|C)||Similar rock structures have been found on different continents.|
|D)||Fossils of animals have been found on continents separated by oceans.|
What kind of movement created the Himalaya Mountains?
|D)||reversals of Earth's magnetic field|
What is the lithosphere?
|A)||the plates that make up the crust and the upper part of the mantle|
|B)||the plates that make up the crust|
|C)||large, flat stones sitting on top of malleable magma|
|D)||the upper part of the mantle|
What is the difference between normal faults and rift valleys?
|A)||Rift valleys are formed from normal faults.|
|B)||Rift valleys sometimes occur near normal faults, but their formation is not related to these faults.|
|C)||Normal faults occur in the northern hemisphere, but rift valleys only occur in the southern hemisphere.|
|D)||Rift valley formation has nothing to do with normal faults.|
A divergent boundary is a boundary between two plates that __________.
|A)||move toward each other|
|B)||move away from each other|
|D)||slide along each other|