The document outlines three main types of seafloor sediments: terrigenous sediments which are derived from eroded rocks on land; biogenous sediments which come from the shells and skeletons of marine life like calcareous ooze from calcium carbonate shells and siliceous ooze from silica shells; and hydrogenous sediments which consist of minerals that crystallize directly from seawater.

1. Seafloor Sediments 14.3

2. Terrigenous Sediment
• Seafloor sediment derived from eroded rocks
on land.

3. Biogenous Sediment
• Seafloor sediment of biological origin, such as
shells and skeletons of marine life.

4. Calcareous Ooze
• Thick, common biogenous sediment produced
by dissolving calcium carbonate shells.

5. Siliceous Ooze
• Biogenous sediment composed of the silica-
based shells of single-celled animals and
algae.

6. Hydrogenous Sediment
• Seafloor sediment consisting of minerals that
crystallize from seawater.

7. Key Concept
• What are the three types of the
ocean-floor sediments?
–The three types are terrigenous
sediments, biogenous sediments and
hydrogenous sediments.

8. Key Concept
• What does terrigenous sediment
consist of?
–Terrigenous sediments consist
primarily of mineral grains that were
eroded from continental rocks and
transported to the ocean.

9. Key Concept
• What is the composition of
biogenous sediment?
–Biogenous sediments consist of shells
and skeletons of marine animals and
algea.

10. Key Concept
• How is hydrogenous sediment
formed?
–Hydrogenous sediment consists of
minerals that crystallize directly from
ocean water through various chemical
reactions.