Oceans

Tsunamis are ocean waves triggered by large earthquakes that occur near or under the ocean, volcanic eruptions, submarine landslides, and by onshore landslides in which large volumes of debris fall into the water.
The term El Niño (Spanish for 'the Christ Child') refers to a warming of the ocean surface (or above-average sea surface temperatures) in the central and eastern tropical Pacific Ocean.
Geology is the study of the Earth.
Coral reefs can be damaged by natural processes,
The USGS has run bathymetric surveys for many m
The USGS has studied sea-surface temperature in