Question

a scientist observes hot water erupting from a vent in the earth.

what most likely caused the water to rise and erupt from the vent?

○ the vent was lower than the water table.
○ a well was drilled into a pressurized aquifer.
○ a well with a mechanical pump was installed.
○ the water was heated by magma or hot rocks.

Explanation:

The described feature is a hot spring/geyser. Hot water erupting from an Earth vent occurs when groundwater is heated by subsurface magma or hot rocks, which lowers its density, increases pressure, and forces it upward to erupt. The other options do not account for the hot water aspect: a vent below the water table would not produce erupting hot water, a drilled pressurized aquifer creates an artesian well (not hot water), and a mechanical pump does not generate naturally erupting hot water.

Answer:

D. The water was heated by magma or hot rocks.