Your sister had gone camping in Uttarakhand. She was fascinated with the smooth striated rocks she had collected. What type of rocks had she brought home with her?

1. Igneous rocks
2. Sedimentary rocks
3. Metamorphic rocks
4. Both (1) and (3)

Which of the following is NOT an organically formed rock?

1. Gypsum
2. Peat
3. Chalk
4. Limestone

Name any three elements of the earth's crust.

Name three types of rocks.