Landslides, mudflows, slump, and creep are all examples of

a.
mechanical weathering.
b.
runoff.
c.
mass movement.
d.
soil formation.

c.  mass movement.

Explanation:

Landslides, mudflows, slump, and creep are all examples of  mass movement or mass wasting. As all these process involves the downward flow or movement of materials such as soil, sand, rocks and other particles which goes down the slope due to the effect of gravity. Such materials due to unstable orientation flow downwards.

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.