Question

Pillow lava structures indicate that?

1) the lava was extruded under water
2) the lava cooled very slowly
3) the rock that formed from the lava is very soft
4) the lava must have flowed uphill
5) the lava must have erupted explosively

Answer 1

Pillow lava structures indicate that the lava was extruded under water.

Step-by-step explanation:

Pillow lava structures indicate that the lava was extruded under water. When lava is extruded under water, it cools rapidly and solidifies quickly, forming characteristic pillow-like shapes. This occurs because water rapidly cools the lava, causing it to contract and form a solid outer crust while the interior continues to flow.