Question

1 3 plates float on the...
a. lithosphere
b. mesosphere
c. asthenosphere
d. stratosphere
1 4 the lithosphere is broken into how many major plates?
a. 5
b. 6
c. 7
d. 8
1 5 which land feature can be formed at two continental convergent boundaries?
a. mid - ocean ridges
b. mountains
c. rift valleys
d. plains
1 6 what process is occurring at b?
a. subduction
b. melting
c. convection
d. sea - floor spreading

Explanation:

Question 13

Tectonic plates float on the asthenosphere, which is a semi - fluid layer of the Earth's mantle. The lithosphere is the rigid outer layer that includes the plates. The mesosphere is a layer of the atmosphere, and the stratosphere is also an atmospheric layer. So the correct option is C.

The lithosphere is broken into 7 major tectonic plates. These are the African, Antarctic, Eurasian, North American, South American, Indian, and Pacific plates (there are also minor plates, but the major ones are 7). So the correct option is C.

At two continental convergent boundaries, the two continental plates collide. Since both are less dense than the mantle, neither subducts. Instead, they crumple and fold, forming mountains. Mid - ocean ridges form at divergent boundaries (ocean - ocean or ocean - continental in some cases). Rift valleys form at divergent boundaries (continental - continental divergence). Plains are not typically formed at convergent boundaries. So the correct option is B.

Answer:

C. asthenosphere

Question 14