Which is an example of an authigenic sediment? a. Quartz sand ...

[iveyjurea]

Which is an example of an authigenic sediment?
  a. Quartz sand
  b. Manganese nodules
  c. Volcanic dust
  d. Diatomaceous earth

Question 2

What is a main source of terrigenous sediments?
  a. Volcanic eruptions
  b. Rivers
  c. Dust and ash
  d. Cosmic dust

[strudel15]

Answer to Question 1

ANS: B
Authigenic sediments are also called hydrogenous sediments. These types of sediments are the results
of chemical interactions with seawater. Information can be found in the section Sediments May be
Classified by Source.

Answer to Question 2

ANS: B
Terrigenous sediments are those derived from land. The erosion on land is carried down rivers to the
ocean. Information can be found in the section Sediments May be Classified by Source.