1. Composition of the Seafloor
Types of Sediment

3. Four types of sediments
The ocean floor is composed of basaltic rock that is covered by sediment.
Hydrogenous sediments
Biogenous sediments
Terrigenous sediments
Cosmogenous sediments

4. Hydrogenous Sediments
Result from _____________reactions within seawater
The reactions cause minerals to come out of solution and form particles that settle on the bottom
Sources include the dissolution of submerged ________and ____________, materials coming from new _________ forming at mid-ocean ridges, chemicals dissolved in _____________ vent water and material dissolved in

5. Biogenous Sediments Biogenous sediments originate from _____________
Primarily deepwater sediments
The particles come from shell and hard skeletons
Majority come from _____________organisms that contain silica (siliceous) or calicum carbonate (calcareous)
Over time, biogenous sediments become ______________ and ______________

6. Calcareous ooze

7. Terrigenous Sediments
Terrigenous sediments come from the _________
Result primarily from erosion by water, wind, and ice
Deposited primarily on the continental shelves

8. Cosmogenous Sediments
Cosmogenous sediments come from ____________ __________(cosmic dust)
May contain microtektites, which are glass particles that form when a large meterorite impacts Earth
Cosmogenous sediments are the ____________ abundant of the sediments