Look at the images of different rocks. Which two rocks have a fine-grained texture?

1 and 5
2 and 3
3 and 5
4 and 1

1 and 5

Explanation:

Image 1 and 5 actually show fine-grained textures of rocks.

Fine-grained textures actually indicates that magmas that are formed at or near the earth's surface cool rapidly. It's known that when magmas cool fast, they prevent very large crystals from growing. When hand samples of fine-grained rocks are taken, they appear homogeneous throughout the rock.