Question

1. why is limestone considered an organic sedimentary rock? it is formed from water evaporating and leaving minerals behind. it is formed from rock fragments that are compacted and cemented together. it is formed from lava hitting hot water and cooling. it is formed from minerals that came from organisms that were once living.

Explanation:

Limestone is an organic sedimentary rock formed from the remains of once - living organisms. These organisms, like coral and shell - bearing mollusks, contain calcium carbonate which accumulates and lithifies over time to form limestone. The other options describe different rock - forming processes: water evaporating and leaving minerals is for evaporite rocks; rock fragments compacted and cemented are for clastic sedimentary rocks; lava cooling forms igneous rocks.

Answer:

It is formed from minerals that came from organisms that were once living.