Using long-term data, researchers studied the effects of large mammal declines—caused by civil war and poaching—on the species composition of savanna ponds. Guillaume Demare conducted the research as part of his doctoral ...
Ecology
Sep 29, 2022
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1
The asteroid is flying through space in the grainy black and white video, when suddenly a massive cloud of debris sprays out in front of it, meaning only one thing: impact.
Planetary Sciences
Sep 28, 2022
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148
A new global survey of city leaders underscores pressing challenges facing municipalities, including rising inequality, extreme heat and flood risks exacerbated by climate change, and a need to rebalance transportation systems ...
Economics & Business
Sep 27, 2022
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10
At first glance, it's hard to see what gold, iron, lead, arsenic, silver, platinum and tin have in common. A look at the periodic table will clear up the confusion: they are all heavy metals, typically categorized as those ...
Plants & Animals
Sep 27, 2022
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3
Nigeria rice farmer Adamu Garba squelched barefoot through his paddy fields, surveying damage from devastating floods that have destroyed farmland across the north of the country.
Environment
Sep 27, 2022
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4
In South Africa, immigrants are often scapegoated as the root of socio-economic problems. In the post-apartheid landscape, Black African immigrants, mainly, from other African countries have been negatively stereotyped as ...
Social Sciences
Sep 26, 2022
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2
Three distinct phases of climate variability in eastern Africa coincided with shifts in hominin evolution and dispersal over the last 620,000 years, an analysis of environmental proxies from a lake sediment record has revealed.
Earth Sciences
Sep 26, 2022
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132
There are at least 20 quadrillion ants on Earth, according to a new study that says even that staggering figure likely underestimates the total population of the insects, which are an essential part of ecosystems around the ...
Plants & Animals
Sep 24, 2022
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69
The impacts of air pollution on human health, economies, and agriculture differ drastically depending on where on the planet the pollutants are emitted, according to a new study that could potentially incentivize certain ...
Environment
Sep 23, 2022
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219
The quality of ground-based astronomical observations delicately depends on the clarity of the atmosphere above the location from which they are made. Sites for telescopes are therefore very carefully selected. They are often ...
Astronomy
Sep 22, 2022
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39
Africa is the world's second-largest and second most-populous continent, after Asia. At about 30.2 million km² (11.7 million sq mi) including adjacent islands, it covers 6% of the Earth's total surface area and 20.4% of the total land area. With a billion people (as of 2009, see table) in 61 territories, it accounts for about 14.8% of the World's human population. The continent is surrounded by the Mediterranean Sea to the north, the Suez Canal and the Red Sea to the northeast, the Indian Ocean to the southeast, and the Atlantic Ocean to the west. Not counting the disputed territory of Western Sahara, there are 53 countries, including Madagascar and various island groups, associated with the continent.
Africa, particularly central eastern Africa, is widely regarded within the scientific community to be the origin of humans and the Hominidae tree (great apes), as evidenced by the discovery of the earliest hominids and their ancestors, as well as later ones that have been dated to around seven million years ago – including Sahelanthropus tchadensis, Australopithecus africanus, A. afarensis, Homo erectus, H. habilis and H. ergaster – with the earliest Homo sapiens (human) found in Ethiopia being dated to ca. 200,000 years ago.
Africa straddles the equator and encompasses numerous climate areas; it is the only continent to stretch from the northern temperate to southern temperate zones.
This text uses material from Wikipedia, licensed under CC BY-SA
