Author Question: What was the primary way sediment was transported to North America (east coast) continental margin ... (Read 72 times)

Haya94 · **on:** Aug 22, 2018

What was the primary way sediment was transported to North America (east coast) continental margin
during the last ice age?
a. Rivers carry the sediment right to the shelf edge.
b. Strong currents carry the sediment to the contential shelf edge.
c. Wind blows sediment from the continent to the shelf edge
d. Glaciers

Question 2

If there is an abundance of foraminifera shells found in a sediment, it would be categorized as:
a. hydrogenous sediment.
b. calcareous ooze.
c. coccolithophore.
d. siliceous ooze.

IRincones · **Reply #1 on:** Aug 22, 2018

Answer to Question 1

ANS: A
The North American continental shelf was exposed above sea level during the last ice age. Rivers
traversed the shelf and transported sediment onto the shelf. This allows sediments from the last ice
age to remain on the ocean floor. Information can be found in the section Neritic Sediments Overlie
Continental Margins.

Answer to Question 2

ANS: B
Ooze is created when at least 30 of the sediment is biogenous in origin. There are two types of oozes
that form. Calcareous oozes are made from the shells of foraminifera, pteropods, and coccolithophores.
These are unable to form below a certain depth. Information can be found in the section Pelagic
Sediments Vary in Composition and Thickness