Question

true or false
10.____rocks are able to be classified using only their color.
11.____the three main groups of rocks are igneous, intrusive, and metamorphic.
12.____rocks are often used for building materials, artwork, and roofing.
13.____it takes rocks only a few years to change from one rock type into a completely different rock type.
14.____once a rock has made its way through the entire rock cycle once, it remains the same type of rock for the rest of time.
15.____the two main types of igneous rocks are known as interior and exterior igneous rocks.
16.____a rocks grain size, shape, and pattern help scientists to identify the rock.
matching
a. igneous b. sedimentary c. metamorphic
17.____conglomerate forms from granules, pebbles, cobbles, and boulders (larger than 2 mm in diameter) that are cemented together.
18.____gneiss is a high - grade rock that forms at high temperatures when granite is subjected to extreme heat and pressure.
19.____obsidian forms when lava from a volcano cools rapidly with minimal crystallization.
20.____slate is a rock that forms at low temperatures when shale or mudstone is subjected to extreme heat and pressure.
21.____marble forms when limestone is subjected to extreme heat and pressure.
22.____limestone forms from the compaction of fragments of marine organisms and is mainly composed of the mineral calcite.

Explanation:

• 10: Rocks cannot be classified solely by color as other properties like texture, mineral composition are also important.
• 11: The three main groups are igneous, sedimentary, and metamorphic (not intrusive which is a type of igneous).
• 12: Rocks have many uses including building materials, artwork, roofing etc.
• 13: Rock transformation (rock cycle) takes thousands to millions of years.
• 14: Rocks can change type multiple times in the rock cycle.
• 15: The two main types of igneous rocks are intrusive and extrusive.
• 16: Grain size, shape, pattern (texture) help in rock identification.
• 17: Conglomerate is a sedimentary rock formed from cemented gravel - sized particles.
• 18: Gneiss is a metamorphic rock formed from granite under high - grade metamorphism.
• 19: Obsidian is an igneous (extrusive) rock formed from rapid lava cooling with little crystallization.
• 20: Slate is a low - grade metamorphic rock formed from shale/mudstone.
• 21: Marble is a metamorphic rock formed from limestone.
• 22: Limestone is a sedimentary rock formed from marine organism fragments (calcite - rich).

Answer:

1. False
2. False
3. True
4. False
5. False
6. False
7. True
8. B. Sedimentary
9. C. Metamorphic
10. A. Igneous
11. C. Metamorphic
12. C. Metamorphic
13. B. Sedimentary