Neptunists believed that: The earth's crust was made from igneous rocks. Before life, the earth was entirely covered by water. Basalt and lava formed the earth's crust. Erosion and deposition created the earth's landforms.

The correct answer is: Before life, the earth was entirely covered by water.

Neptunists propose a theory of geology called neptunism which propose that rocks are formed from the crystallisation of minerals. They also believe that all the rocks of the Earth's crust were dissolved in the heated waters of a universal sea.