Question

below a depth of 1000 m, the density of ocean water __.
graph with axes: ocean depth (m) on y - axis; density (g/m³), salinity (%), temperature (°c) on x - axes. curves labeled temperature, density, salinity.
text alternative
options:
a) continues to increase
b) cannot be determined by the vertical line of the graph
c) continues to decrease
d) remains constant

Explanation:

To determine the density of ocean water below 1000 m, we analyze the graph. The density curve (labeled "Density") after 1000 m depth shows no upward or downward trend; it becomes relatively flat, indicating that the density remains constant as depth increases beyond 1000 m. Option A is incorrect as density does not continue to increase. Option B is wrong because the graph (vertical axis for depth, density axis) allows determination. Option C is incorrect as density does not decrease. Thus, the density remains constant.

Answer:

D) remains constant