Hydrogenous Sediment

Types of seafloor sediments
Hydrogenous sediment
Minerals that crystallize directly from seawater
Most common types include
Manganese nodules
Calcium carbonates
Metal sulfides
Evaporites

Distribution
Coarse terrigenous deposits dominate continental margin areas
Fine-grained terrigenous material is common in deeper areas of the ocean basin
Hydrogenous sediment comprises only a small portion of deposits in the ocean
There are a few places where very little sediment accumulates (mid-ocean ridges)

Resources from the Seafloor

Energy resources
Oil and gas
Gas hydrates
Other resources
Sand and gravel
Evaporative salts
Manganese nodules