Question

granite and rhyolite are chemically the same but where they crystallized determines if they have a coarse or fine texture. a. true b. false the top and bottom layers of the mantle are strong and hard but an intermediate layer is weak and able to flow very slowly. a. true b. false the vast amount of sandstone found in utah tells a geologist that ancient sand dunes once existed in the area. a. true b. false studies of earths history have revealed that catastrophic events such as earthquakes, tsunamis, and meteorite impacts rarely occur. a. true b. false if you find a piece of obsidian in the field, you have discovered an intrusive, plutonic igneous rock. a. true b. false if you discover a clastic sedimentary rock in the field, you have found the least common type of earths crust. a. true b. false during the early stage of earths formation, a majority of the material making up the planet was similar to the modern crust existed at that time. a. true b. false processes that occur slowly over geologic time, such as the deposition of the layers of sediment and the later erosion of the rock by a river, can significantly change earths surface. a. true b. false

Explanation:

1. Granite and rhyolite are chemically similar, with texture determined by crystallization location.
2. Mantle has strong top - bottom layers and a weak intermediate layer.
3. Sandstone indicates past sand dune existence.
4. Catastrophic events are not rare in Earth's history.
5. Obsidian is an extrusive, not intrusive igneous rock.
6. Clastic sedimentary rocks are not the least common in Earth's crust.
7. Early Earth material was not similar to modern crust.
8. Slow geological processes can change Earth's surface.

Answer:

1. a. True
2. a. True
3. a. True
4. b. False
5. b. False
6. b. False
7. b. False
8. a. True