Question

which statement is an example of an observation a scientist would make to classify a rock? a rock is larger than other rocks. a rock was found in a stream. a rock is formed from molten lava. a rock cracks in half after a rainstorm.

Explanation:

When classifying rocks, scientists consider their origin. Igneous rocks are formed from molten lava. The statement "A rock is formed from molten lava" directly relates to the rock - forming process, which is a key factor in rock classification. The other statements (size comparison, location found, and cracking after a rainstorm) do not pertain to the fundamental characteristics used for rock classification (such as origin, mineral composition, texture etc.).

Answer:

C. A rock is formed from molten lava.