The fossil remains of a sea cow from the Miocene Period reveal bite marks that suggest it was attacked by a crocodile and subsequently scavenged by sharks.
Landslide-triggered tsunamis due to melting glaciers and permafrost are becoming more common with global warming. Read more about Alaska and Greenland.
Super-marine heatwaves - extremely strong periods of hot weather - played a role in 2023's record high sea temperatures according to research published in July.
An international team of scientists has determined that Chicxulub dinosaur-killing asteroid was carbonaceous and originated from the deep outer solar system.