<\/span><\/h3>\nThe oldest corals appeared about 500 million years ago or even earlier. Researchers point out that they originated as simple, solitary organisms and have evolved into the beautiful coral reefs that exist today with time and constant environmental change.<\/p>\n
In the Ice Age, about 440 million years ago, sea temperatures dropped exponentially and large numbers of corals began to shrink from the ocean. This is called the Ordovician-Silurian extinction. About 410 million years ago, in the Devonian period, corals began to appear again. At the end of this period, rocky corals, which were a rare form of reefs at the time, began to grow. Then, about 350 million years ago, corals disappeared again due to unstable sea levels.<\/p>\n
After 100 million years, the corals reappeared and were destroyed again by the disappearance of Perm-Triassic 250 million years ago, affecting more than 90% marine creatures. Reduced oxygen levels and increased levels of carbon dioxide at sea led to this tragic event of extinction.<\/p>\n
After disappearing and appearing a few million years ago, coral reefs finally reappeared 46 million years ago and last disappeared in the Middle Ages. 20 million years later, they finally returned to Australia in the form of the Great Barrier Reef, discovered in 1770 by British explorer Captain James Cook.<\/p>\n
Recently, some of the finest reefs have shrunk due to coral extinction, rising ocean temperatures and toxic pollution. In addition, fishing and the use of various care products and increased tourism are also considered threats to the well-being of coral reefs.<\/p>","protected":false},"excerpt":{"rendered":"
World Reef Day is celebrated every year on June 1, and it helps raise public awareness of the fragile biological system of our world's ocean coral reefs. This day brings together a variety of people, including divers, aquatic advocates and social activists to come [\u2026]<\/p>","protected":false},"author":1,"featured_media":7104,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-7101","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nirsanas-pasakumi"],"yoast_head":"\n
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trainer and professional photographer, underwater operator. Began diving on October 20, 2005, undergoing training at the Professional Association of Diving Instructors, DIPA (Eng. PADI - Professional Association of Diving Instructors), trained in professional development training for diving in the Adriatic and Ionian seas, the islands of the North Atlantic Ocean, the Red Sea, the Norwegian Sea and in the Mediterranean. Participated in an underwater archaeological project in Latvia. On July 24, 2006, he founded the diving club "Daivings.lv". Made more than 5000 scuba dives. Has participated in many diving expeditions, is interested in ecology and how climate change affects the underwater world.","url":"https:\/\/daivings.lv\/en\/author\/admin\/"}]}},"_links":{"self":[{"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/posts\/7101","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/comments?post=7101"}],"version-history":[{"count":0,"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/posts\/7101\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/media\/7104"}],"wp:attachment":[{"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/media?parent=7101"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/categories?post=7101"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/daivings.lv\/en\/wp-json\/wp\/v2\/tags?post=7101"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/daivings.lv\/wp-content\/uploads\/Pasaules-rifu-apzinasanas-diena-1.junija-300x211.jpg\")
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