Question

1. Where trenches do not exist, the steep continental slope merges more into a more gradual incline known as the continental____.
a. abyss
b. rise
c. zone
d. rift

2. Deep, steep-sided valleys that originate on the continental slope and may extend to the ocean basin floor are called____.

a. slope canyons
b. submarine canyons
c. abyssal plains
d. trenches

Answer 1

The right options are;

1. b. rise

2. b. submarine canyons

Continental rise is the bottom feature of water that is composed of thick sequences of continental substances that coalesced between the continental slope and the deep ocean floor. Continental rises occurs due to three sedimentary processes which are vertical accumulation of biogenic and clastic substances, mass wasting and the deposition from contour currents.

Submarine canyons are deep, narrow steep-sided valleys that emanate from the continental slope and sometimes may extend to the ocean basin floor (continental shelf). The physical appearance of submarine canyons resembles canyons formed by rivers on land.

Answer 2

1. b. rise
 2. b. submarine canyons