Question

these cover the largest area of the earths surface?
mid-ocean ridges
ocean basins
trenches
none of these

the creation of new crustal material takes place at mid - ocean ridges, where the oceanic crust is rifted open and magma wells up to fill the opening.
true
false

magma is formed when solid rock in the crust and upper mantle______.
vaporizes
melts
crystallizes
cools

Explanation:

1. Ocean basins cover ~70% of Earth's surface, larger than mid-ocean ridges or trenches.
2. Mid-ocean ridges are divergent boundaries where magma creates new oceanic crust.
3. Magma forms when solid rock in the crust/upper mantle melts due to temperature/pressure changes.

Answer:

1. B. Ocean Basins
2. A. True
3. B. Melts