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Author Question: What kind of sand is on white-sand beaches? Black-sand beaches? Give some details about each type. ... (Read 47 times)

bobypop

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on: Jul 16, 2018
What kind of sand is on white-sand beaches? Black-sand beaches? Give some details about each type.
 
  What will be an ideal response?

Question 2

What is a way humans try to stop beach erosion?
 
  What will be an ideal response?


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234sdffa

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Reply #1 on: Jul 16, 2018
Answer to Question 1

Answer: Many white-sand beaches contain mostly quartz. Quartz is abundant in river sediment delivered to the sea because it is the weathering-resistant mineral that is most abundant in continental rocks. Quartz also lacks cleavage, so continuous movement and abrasion by waves do not easily break it. Black-sand beaches are common on basaltic volcanic islands. Basalt does not contain quartz to produce white sand, but the fine-grained igneous rock is crushed into small sand-size grains by wave erosion along the shore.

Answer to Question 2

Answer: By building groins, which are walls built perpendicular to the shoreline, and trap sediment on the upcurrent side to widen a beach. The longshore current erodes the beach, however, on the downcurrent side of the groin.


bobypop

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Reply 2 on: Jul 16, 2018
Gracias!

FergA

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Reply 3 on: Yesterday
Excellent

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