Drifting Continents
Sea-Floor Spreading
Plate Tectonics
Grab Bag
Trivia!
100
The theory that continents slowly move over earth's surface.
Continental Drift
100
Mountain ranges that can be found at the bottom of the ocean and indicate where two plates are pulling apart and allowing magma to billow up and form new ocean floor.
Mid-Ocean Ridges
100
The theory which states that Earth's plates are in slow, constant motion, driven by convection currents in the mantle.
Plate tectonics
100
The San Andreas Fault, which causes earthquakes in California, is situated along what kind of boundary? (Hint: It is NOT the kind of boundary along which 80% of earthquakes occur.)
Transform boundary
100
Which US state is home to Acadia National Park?
Maine
200
The supercontinent that scientists believe existed about 300 million years ago whose name means "one earth".
Pangaea
200
Deep underwater canyons that indicate where part of the ocean floor is sinking back into the mantle.
deep-ocean trenches
200
A break in earth's crust where rocks have slipped past one another.
Fault
200
The North American and Eurasian, Caribbean and African, and South American and African tectonic plates are all pulling apart. What does this mean for the Atlantic Ocean?
It is getting larger because of seafloor spreading at each of those mid-ocean ridges.
200
In which year was Earth Day first celebrated?
1970
300
Any trace of an ancient organism that has been preserved in rock.
Fossil
300
The process by which the ocean floor sinks back into the mantle beneath a deep-ocean trench.
Subduction
300
Place where pieces of earth's crust diverge on land.
Rift valley
300
Why does finding fossils of tropical plants in Scandinavia serve as evidence for continental drift?
It proves that Scandinavia was once down in the tropics/further south.
300
What 1927 film effectively ended the silent movie era by introducing synchronized talking and singing?
The Jazz Singer
400
The first scientist to propose the idea that would become continental drift in 1910.
Alfred Wegener
400
The process by which magma at mid-ocean ridges continually adds new material to the ocean floor.
sea-floor spreading
400
The pieces into which the lithosphere is broken.
Plates
400
What THREE pieces of evidence do scientists look to for proof of sea-floor spreading?
1. Drilling Samples. Rock samples further away from a ridge are older, while samples closer to a ridge are newer.
2. Ocean-Floor Material. "Pillow rocks" that only form when magma cools under water.
3. Magnetic Strips. Because earth's magnetic poles change, and magnetic materials inside cooled magma arrange themselves with the magnetic poles, strips of different magnetic alignments must indicate different ages.
400
The majority of adults have how many permanent teeth?
32
500
What THREE pieces of evidence do scientists use to support continental drift?
1. Evidence from land features.
2. Evidence from fossils.
3. Evidence from climate.
500
A device that uses sound waves to measure the distance to something.
Sonar
500
Name all THREE kinds of plate boundaries and what the plates do at each.
1. Divergent boundary-- move apart.
2. Convergent boundary-- move together.
3. Transform boundary-- slip past one another.
500
Judging by the image below of the plates moving around the Pacific (the arrows show which ways they are moving), what is slowly happening to the Pacific Ocean?
The Pacific Ocean is slowly getting smaller.
500
Which US president is estimated to have had the highest IQ?
John Quincy Adams