Question

a sedimentary rock that shows ripple marks was found. what do the ripple marks tell about the area where the rock formed? the rock formed in a fast - moving stream. the rock formed at very high temperatures. the rock formed from mollusk shells. the rock was blown out of a volcano.

Explanation:

Ripple marks in sedimentary rocks are formed by the action of water (like in streams) or wind. Fast - moving streams can create ripple marks as the water flows over loose sediment. High temperatures are associated with igneous rocks (formed from magma/lava) or metamorphic rocks (formed by heat and pressure), not sedimentary rocks with ripple marks. Rocks formed from mollusk shells would be more likely to show shell fragments rather than just ripple marks. Rocks blown out of a volcano are igneous (pyroclastic).

Answer:

The rock formed in a fast - moving stream.