How is continental crust different from oceanic crust?
a.
oceanic crust is thicker and more dense than continental crust.
b.
oceanic crust is thicker and less dense than continental crust.
c.
oceanic crust is thinner and more dense than continental crust.
d.
oceanic crust is thinner and less dense than continental crust.
where do subduction zones often occur?
a.
where a continental plate is being split into two parts
b.
where an oceanic plate is moving toward a continental plate
c.
where two oceanic plates are moving away from each other
d.
where two continental plates are colliding
look at the section of tectonic map. describe what is happening at the plate boundary. missing metadata
a.
the seafloor is spreading.
b.
an oceanic plate is subducting.
c.
two continental plates are colliding.
d.
two plates are sliding past each other.
the map goes to question 3.

1- Option (C)

2- Option (B)

3- Option (A)

Explanation:

The continental crust is thick and is about 35 to 40 km on an average and is comprised of less denser granitic rocks that contains minerals such as quartz and feldspar. But, oceanic crust is thin and about 7-10 km on an average and are comprised denser basaltic rocks containing minerals such as pyroxene, olivine and alkali feldspar. Thus, the oceanic crust are thinner and denser than the continental crust.

In a convergent plate boundary, when an oceanic plate move towards the continental crust, the denser oceanic crust sinks below the lighter plate, as a result of which it forms a subduction zone that is marked by the trench. It generates deep-focus earthquakes and also forms volcanoes on the over-riding plate.

Seafloor spreading refers to the separation of the oceanic plate along the mid oceanic ridge, which results in the enlargement of the ocean basin and leads to the addition of new materials to the crust. It occurs in a divergent plate motion.

Thus, the correct answers are matched above.

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explanation:

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