40. 40. Could a rhyolite become a sedimentary rock? a. Yes, if it is eroded and

Question

40.

40. Could a rhyolite become a sedimentary rock? a. Yes, if it is eroded and deposited b. Yes, if it is under enough heat and pressure c. No, it could never become a sedimentary rock 41. How could granite become a sandstone? a. First the material on top of the granite must be eroded away, then it is mechanically w sized pieces, then those pieces are moved to a new location. Once those pieces stop moving they need to be squeezed together and stuck together to form a single rock. ite is a felsic igneous rock, it needs to be chemically weathered to form dissolved minerals. dissolved minerals need to be transported to a new location where they are precipitated out of the b. Since granite a These wa ter and form pieces of sand that get cemented together to form sandstone. grains in the granite are released when magma is cooling. Then those sand grains need to pile up dunes in a desert. After they are compacted and cemented, they are transported to a stream and there they become a sandstone. 42. Which environment is the most likely place that coal is deposited? a. Coral reef b. Quiet lake c. Swamp d. Beach 43. Which environment is the most likely place that conglomerate is deposited? a. Coral reef b. Swamp c. Streambed d. Quiet lake

Explanation / Answer

40. a) Yes, if it is eroded and deposited.

A rhyolite can be weathered to form sand sized grains which on erosion and transportation maybe deposited in favourable sites. The grains may later go compaction and cementation to form sandstone,

41. A) First the material on top of the granite must be eroded away, then it is mechanically weathered into sand-sized pieces, then those pieces are moved to a new location. Once those pieces stop moving they need to be squeezed together and stuck together to form a single rock.

42. c) Swamp

Explanation: Coal is formed as a result of compaction and partial decomposition of plant matter. Swampy areas are the most likely place where the plant matter is deposited under water such that the plant matter is only partially decomposed.

43. c) Streambed

Explanation: Conglomerates are pebble/cobble sized rounded grains which are cemented and compacted together. For transportation of pebble/ cobble sized grains velocity of the fluid carrying the sediments should be great, which is possible in streambed.

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