Scientists have shown how the freezing of a 'slushy' ocean of magma may be responsible for the composition of the Moon's crust.
Planetary Sciences
Jan 13, 2022
0
98
Carbon dioxide (CO2) levels today are higher than at any point in the past 800,000 years or more.
Earth Sciences
Jan 07, 2022
2
52
How is our Earth's inner core like a cake? According to Professor Hrvoje Tkalčić and Sheng Wang from The Australian National University (ANU), there are more similarities than you might think.
Earth Sciences
Dec 14, 2021
0
67
The natural structure of the rigid oceanic crust that forms a shell around Earth contains cracks and faults. These fissures are hydrothermal pathways for heat, water, and chemical solutions to move between the ocean and the ...
Earth Sciences
Dec 10, 2021
0
220
Earth's crust is constantly in motion. As tectonic plates that make up the lithosphere shift, pulling apart and crashing into each other, the crust fractures and folds in response. Both faulting and folding play out at fault-bend ...
Earth Sciences
Dec 07, 2021
0
7
Home to some of the highest mountains in the world, including the legendary Mount Everest, the vast Himalayan-Tibetan plateau is often referred to as the "Roof of the World." With an average elevation of 4500 meters above ...
Earth Sciences
Nov 26, 2021
0
59
In Earth's crust, tectonic blocks slide and grind past each other like enormous ships loosed from anchor. Earthquakes are generated along these fault zones when enough stress builds for a block to stick, then suddenly slip.
Earth Sciences
Nov 24, 2021
0
132
With an area of 2.5 million square kilometers and an altitude that can exceed 4,500 meters, the Tibetan Plateau is the largest and highest plateau on Earth. Although its formation over the past 65 million years is broadly ...
Earth Sciences
Nov 01, 2021
0
41
Geochemical and geological records provide key insights into Earth's tectonic history, but in the case of mountains during the Proterozoic eon, records conflict with each other: Geochemical evidence says that the crust was ...
Earth Sciences
Oct 07, 2021
0
861
The dwarf planet Vesta is helping scientists better understand the earliest era in the formation of our solar system. Two recent papers involving scientists from the University of California, Davis, use data from meteorites ...
Planetary Sciences
Oct 06, 2021
1
158
Thylacocephala? Branchiopoda
Remipedia Cephalocarida Maxillopoda
Ostracoda
Malacostraca
Crustaceans (Crustacea) form a very large group of arthropods, usually treated as a subphylum, which includes such familiar animals as crabs, lobsters, crayfish, shrimp, krill and barnacles. The 50,000 described species range in size from Stygotantulus stocki at 0.1 mm (0.004 in), to the Japanese spider crab with a leg span of up to 12.5 ft (3.8 m) and a mass of 44 lb (20 kg). Like other arthropods, crustaceans have an exoskeleton, which they moult to grow. They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous (two-parted) limbs, and by the nauplius form of the larvae.
Most crustaceans are free-living aquatic animals, but some are terrestrial (e.g. woodlice), some are parasitic (e.g. fish lice, tongue worms) and some are sessile (e.g. barnacles). The group has an extensive fossil record, reaching back to the Cambrian, and includes living fossils such as Triops cancriformis, which has existed apparently unchanged since the Triassic period. More than 10 million tons of crustaceans are produced by fishery or farming for human consumption, the majority of it being shrimps and prawns. Krill and copepods are not as widely fished, but may be the animals with the greatest biomass on the planet, and form a vital part of the food chain. The scientific study of crustaceans is known as carcinology (alternatively, malacostracology, crustaceology or crustalogy), and a scientist who works in carcinology is a carcinologist.
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