Since Texas Gov. Greg Abbott first declared an emergency at the border in 2021, he’s renewed or amended the proclamation at least 69 times. The proclamation has greatly expanded his powers without ...

This animation shows the dynamic process of how a coral atoll forms. Corals (represented in tan and purple) begin to settle and grow around an oceanic island forming a fringing reef. It can take as ...

Most reef-building corals contain photosynthetic cells called zooxanthellae that live in their tissues. The corals and zooxanthellae have a mutualistic relationship. This means there is a positive ...