Chapter 10

Question 1

Suggest one reason why the Law of Conservation might support the idea of recycling rock in the universe.

Answer 1

Because if matter can’t be destroyed or created, then something would have to replace the magma that spews up from the earth; Think of plate tectonics, the subvergent plates are sliding under another one and melting to form more magma, why can’t it be the same with rocks?

Question 1

Why can’t you use mineral hardness tests or streak tests to identify most rocks?

Answer 1

Because rocks are mixtures of minerals.

Question 2

What are grains in a rock? How do they assist in classifying rock?

Answer 2

1. The size, shape and appearance of individual rock grains
2. Based on certain appearances grains can tell how a rock formed.

Question 3

What minerals make up granite?

[my] Orthodontist Quali Beatrice Makes Plastic [angie o plasty]

Answer 3

The major minerals are orthocase, quartz, biotate, mascovite, and plagioclase.

Question 4

Describe the three general types of course-grained igneous rocks.

Answer 4

1. Pegmatite: Exceptionally large crystal formation, rare minerals, almost entirely crystal.
2. Porphyry: Larger crystals embedded in a fine-grained groundmass.
3. Phanerite: Contains large enough crytals to be seen with the naked eye.