Answer:
Gabbro and basalt
Explanation:
The oceanic crust is mainly made of gabbro rocks and different types of basalt rocks.
The most active volcanoes are located in South America and the bottom of North America
Submarine Canyon
Submarine Canyon's are steep-sided valley canyons cut into the seabed of the continental slope.
Streams flowing from mountainous terrain commonly flow across alluvial fans at the edges of the valleys. ... In arid and semiarid regions, seepage of water<span> from the stream can be the principal </span>source<span> of aquifer recharge.</span>
