Extinction event
An extinction (level) event (also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the amount of life on Earth. Such an event is identified by a sharp change in the d...
Extinction event - Wikipedia
Nemesis (hypothetical star)
Nemesis is a hypothetical red dwarf or brown dwarf, originally postulated in 1984 to be orbiting the Sun at a distance of about 95,000 AU (1.5 light-years), somewhat beyond the Oort cloud, to explain ...
Sea level rise
Current sea level rise is about 3 mm/year worldwide. According to the US National Oceanic and Atmospheric Administration (NOAA), "this is a significantly larger rate than the sea-level rise avera...
Sea level rise - Wikipedia
Permian–Triassic extinction event
The Permian–Triassic (P–Tr) extinction event, colloquially known as the Great Dying or the Great Permian Extinction, occurred about 252 Ma (million years) ago, forming the boundary between the Permian...
Permian–Triassic extinction event - Wikipedia
Permian-Triassic extinction event
The Permian–Triassic (P–Tr) extinction event, colloquially known as the Great Dying or the Great Permian Extinction, occurred about 252 Ma (million years) ago, forming the boundary between the Permian...
Permian-Triassic extinction event - Wikipedia
Cat gap
The cat gap is a period in the fossil record of approximately 25 to 18.5 million years ago in which there are few fossils of cats or cat-like species found in North America. The cause of the "cat gap"...
Cat gap - Wikipedia
Marine regression
Marine regression is a geological process occurring when areas of submerged seafloor are exposed above the sea level. The opposite event, marine transgression, occurs when flooding from the sea covers...
Dinoflagellate
The dinoflagellates (Greek δῖνος dinos "whirling" and Latin flagellum "whip, scourge") are a large group of flagellate protists that constitute the phylum Dinoflagellata. Most are marine plankton, but...
Dinoflagellate - Wikipedia
Algae
Algae (/ˈældʒiː/ or /ˈælɡiː/; singular alga /ˈælɡə/, Latin for "seaweed") are a very large and diverse group of eukaryotic organisms, ranging from unicellular genera such as Chlorella and the diatoms ...
Algae - Wikipedia
Paramecium bursaria
Paramecium bursaria is a species of ciliate protozoan that has a mutualistic symbiotic relationship with green algae called Zoochlorella. The algae live inside the Paramecium in its cytoplasm and prov...
Paramecium bursaria - Wikipedia
Rahjamal Traps
The Rajamal Traps is a volcanic igneous province in Eastern India, covering the parts of Jharkhand, West Bengal and Meghalaya. Rajmahal hills of Jharkhand is the type area of this province. Multiple l...
Rahjamal Traps - Wikipedia
Yellowstone Caldera
The Yellowstone Caldera is the volcanic caldera and supervolcano located in Yellowstone National Park in the United States, sometimes referred to as the Yellowstone Supervolcano. The caldera and most...
Yellowstone Caldera - Wikipedia
Global warming
Global warming and climate change can both refer to the observed century-scale rise in the average temperature of the Earth's climate system and its related effects, although climate change can also r...
Global warming - Wikipedia
Glacial period
A glacial period (or alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances. Interglacials, on th...
Glacial period - Wikipedia
Cretaceous-Tertiary extinction event
The Cretaceous–Paleogene (K–Pg) extinction event, formerly known as the Cretaceous–Tertiary (K–T) extinction, was a mass extinction of some three-quarters of plant and animal species on Earth—includin...
Cretaceous-Tertiary extinction event - Wikipedia
Toba catastrophe theory
The Toba supereruption was a supervolcanic eruption that occurred some time between 69,000 and 77,000 years ago at the site of present-day Lake Toba (Sumatra, Indonesia). It is one of the Earth's larg...
Toba catastrophe theory - Wikipedia
End-Ediacaran extinction
Evidence suggesting that a mass extinction occurred at the end of the Ediacaran period, 542 million years ago, includes:
During the Ediacaran period, two main groups of organisms are found in the ...
Carboniferous Rainforest Collapse
The Carboniferous Rainforest Collapse (CRC) was a minor extinction event that occurred around 305 million years ago in the Carboniferous period. It altered the vast coal forests that covered the equat...
Carboniferous Rainforest Collapse - Wikipedia
Aptian extinction
The Aptian extinction was an extinction event of the early Cretaceous Period. It is dated to c. 116 or 117 million years ago, in the middle of the Aptian stage of the geological time scale, and has so...
Plastid
The plastid (Greek: πλαστός; plastós: formed, molded – plural plastids) is a major double-membrane organelle found, among others, in the cells of plants and algae. Plastids are the site of manufactur...
Plastid - Wikipedia
Impact event
An impact event is a collision between celestial objects causing measurable effects. Impact events have physical consequences and have been found to regularly occur in planetary systems, though the m...
Impact event - Wikipedia