Chapter 3 Section 3.2 Igneous Rocks Worksheet Answers

Explain why granite is often used for countertops and monuments. Answer: Granite is an intrusive igneous rock that cooled slowly, creating interlocking crystals of quartz and feldspar. This interlocking crystal structure makes it extremely hard, durable, and resistant to weathering and scratches . It can also be polished to a high shine.

Dark-colored, dense rocks rich in iron and magnesium. chapter 3 section 3.2 igneous rocks worksheet answers

You find a rock that is dark gray, fine-grained, and full of tiny holes (vesicles). What is the most likely name of this rock, and how did the holes form? Answer: The rock is Scoria (or vesicular basalt). The holes (vesicles) formed when gas bubbles (volatiles) were trapped as the lava cooled rapidly on the surface. Explain why granite is often used for countertops

A mix of large and small crystals, indicating two different cooling rates. 3. Classification by Composition It can also be polished to a high shine

Answer: The three main types of igneous rocks are intrusive igneous rocks (e.g., granite), extrusive igneous rocks (e.g., basalt), and pyroclastic rocks (e.g., obsidian).