This hypothesis suggests that the continents moved slowly to their current locations.
What is continental drift?
100
The large landmass that Alfred Wegner hypothesized broke up about 200 million years ago is known as this.
What is Pangea?
100
These are the 3 lines of evidence that support the idea of continental drift.
What are fossils, evidence of similar past climates, and similar types of rock?
100
The idea that hot, less dense material below Earth’s crust rises toward the surface at the mid-ocean ridges and then flows sideways, carrying the seafloor away from the ridge in both directions is known as this.
What is seafloor spreading?
100
Evidence for seafloor spreading is this.
What are differences in directions of rock’s magnetic fields and age patterns in the ocean floor?
200
A newer theory that combines continental drift and seafloor spreading is known as this.
What is plate tectonics?
200
Sections of Earth’s crust that float on the plastic-like mantle are known as this.
What are plates?
200
A rigid layer of the Earth’s crust that is about 100 km thick and is generally less dense than the material underneath is known as this.
What is the lithosphere?
200
The plastic-like layer below the lithosphere is known as this.
What is the asthenosphere?
200
These are the three types of plate boundaries.
What are convergent, divergent boundaries, and transform boundaries?
300
The Himalaya Mountains are the result of this type of plate boundary.
What is a convergent boundary?
300
The volcanoes found along the Cascade Mountains are the result of this type of plate boundary.
What is a convergent boundary?
300
The Great Rift Valley in Africa and the Mid-Atlantic Ridge are examples of this type of plate boundary.
What are divergent boundaries?
300
This is the engine that drives the movement of tectonic plates on Earth’s surface.
What is convection of Earth’s mantle?
300
This war-time invention permitted the discovery of the Mid-Atlantic Ridge, a divergent plate boundary.
What is sonar?
400
At a convergent plate boundary, the more dense (usually underwater) plate does this.
What is subducted and melted?
400
This word means a plate is pulled under a less dense plate.
What is subduction?
400
If new plate material is continually made at divergent plate boundaries, why does not the Earth continually grow in size?
What is plates are recycled at the same rate new plates are produced?
400
The newest rock in a mid-ocean ridge is found where.
Where is closest to the center?
400
These two layers of the Earth’s crust make up Earth’s upper mantle.
What are the asthenosphere and the lithosphere?
500
A plate boundary (often volcanic) where plates move apart are known as this.
What are divergent boundaries?
500
A plate boundary (often volcanic) where one plate is pushed under another is known as this.
What are convergent boundaries?
500
A plate boundary where one plate slides past another is known as this.
What are transform boundaries?
500
The San Andreas fault is an example to this type of plate boundary.
What is a transform boundary?
500
Very explosive volcanoes are typically associated with this type of plate boundary.