Science, Unit 3, Lesson 6
What causes Earth's plates to move continuously?
Earth's plates move continuously in response to slow-moving convection currents in the mantle.
Which type of plate boundary or zone would be most likely to lead to above-ground volcanic activity?
Subduction zone
What force drives the movement of plates in the mantle?
convection currents
In what way does a transform boundary differ from the other boundary types?
At a transform boundary, the plates move in a direction that is parallel to the boundary line.
Which boundary or zone adds new material to the lithosphere (the hard outer crust of the Earth)?
Divergent boundary
Which layer has the tectonic plates?
Lithosphere
What happens at the mid-ocean ridge?
Molten magma rises from the mantle to make new oceanic crust.
Mesosphere
The strong, lower part of the mantle between the asthenosphere and the outer core
Collision Boundary
When two continental plates collide together
divergent boundary
a plate boundary where two plates move away from each other
transform boundary
a plate boundary where two plates move past each other in opposite directions
convergent boundary
a plate boundary where two plates move toward each other
Himalaya Mountains were formed by
collision boundary
The highest mountains in the world are the Himalayas, at the border between the Indian and Eurasian plates. The Himalayas formed in a ________________.
collision zone
4 types of plate boundaries
convergent, divergent, and transform, collision boundaries
Divergent boundary pulls apart, magma flow up to create
new seafloor
Glacier Striations
scratches left on the surface of rocks as glaciers move over the surface.
Lithosphere
the solid, outer layer of the earth that consists of the crust and the rigid upper part of the mantle
theory of plate tectonics
the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle
Asthenosphere
the upper layer of the earth's mantle, below the lithosphere, and convection is thought to occur.
