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Tree of Life
Plant Flower, Tree
Invertebrate Octopus, Ant, Bee, Butterfly, Spider, Lobster
Vertebrate Fish, Seahorse, Ray, Shark, Frog, Turtle, Tortoise, Dinosaur
Bird, Ostrich, Owl, Crow, Parrot
Mammal Bat, Rabbit, Giraffe, Camel, Horse, Elephant, Mammoth
Whale, Dolphin, Walrus, Seal, Polar Bear, Bear, Cat, Tiger, Lion, Dog, Wolf
Monkey, Chimpanzee, Human
These are organized by a classification scheme developed exclusively for Cosma. More…
desert : arid land with usually sparse vegetation
especially : such land having a very warm climate and receiving less than 25 centimeters (10 inches) of sporadic rainfall annually — Webster
Desert is a barren area of landscape where little precipitation occurs and consequently living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to the processes of denudation. About one third of the land surface of the world is arid or semi-arid. This includes much of the polar regions where little precipitation occurs and which are sometimes called polar deserts or “cold deserts”. Deserts can be classified by the amount of precipitation that falls, by the temperature that prevails, by the causes of desertification or by their geographical location. — Wikipedia
Desert climate, also known as an arid climate, is a climate in which precipitation is too low to sustain any vegetation at all, or at most a very scanty shrub, and does not meet the criteria to be classified as a polar climate.
An area that features this climate usually experiences from 25 to 200 mm (7.87 inches) per year of precipitation and in some years may experience no precipitation at all. Averages may be even less such as in Arica, Chile, where precipitation normals annually stand at around 1 mm per year. In some instances, an area may experience more than 200 mm of precipitation annually, but is considered a desert climate because the region loses more water via evapotranspiration than falls as precipitation (Tucson, Arizona, and Alice Springs, Northern Territory, are examples of this). — Wikipedia
Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.
- Climate change tipping points may be too simple a...on October 7, 2021 at 6:00 pm
We regularly hear warnings that climate change may lead to 'tipping points': irreversible situations where savanna can quickly change into desert, or the warm gulf stream current can simply stop flowing. These cautions often refer to spatial patterns as early-warning signals of tipping points. An international team of ecologists and mathematicians has studied these patterns and come to a surprising conclusion. "Yes, we need to do everything we can to stop climate change," the authors said in […]
- Crayfish and carp among the invasive species...on October 7, 2021 at 7:54 am
Certain invasive, non-native species can disrupt lakes to the point of rapid ecosystem collapse, contaminating water for drinking, aquaculture and recreation, a new study has found.
- New 'lost relative' of Triceratops found in New...on October 5, 2021 at 11:19 am
A fossil found over twenty years ago on the ranch of CNN founder Ted Turner has been discovered to be a new species of horned dinosaur (ceratopsid) not previously found in North America.
- Indigenous knowledge and the persistence of the...on October 1, 2021 at 12:17 pm
Aboriginal people in Australia view wilderness, or what is called "wild country," as sick land that's been neglected and not cared for. This is the opposite of the romantic understanding of wilderness as pristine and healthy—a view which underpins much non-Indigenous conservation effort.
- 25-million-year-old ancient eagle ruled the roost...on September 27, 2021 at 2:00 pm
A 25-million-year-old eagle fossil found in South Australia adds to the long evolutionary history of raptors in Australia.