Reference Terms
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Metamorphic rock
Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means "change in form".
Note: The above text is excerpted from the Wikipedia article "Metamorphic rock", which has been released under the GNU Free Documentation License.
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Earth & Climate News
March 12, 2025
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Mar. 10, 2025 — Scientists have discovered that whales move nutrients thousands of miles -- in their urine -- from as far as Alaska to Hawaii. These tons of nitrogen support the health of tropical ecosystems and fish, where nitrogen can be limited. They call this ...
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Mar. 6, 2025 — Researchers have discovered the world's oldest known meteorite impact crater, which could significantly redefine our understanding of the origins of life and how our planet was shaped. The team found evidence of a major meteorite impact 3.5 billion ...
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Mar. 12, 2025 — Experiencing five or more severe sunburns between the ages of 15 and 20 increases the risk of melanoma by 80% and nonmelanoma skin cancer by 68%. This study is among the few to examine the ...
Mar. 12, 2025 — Physicists have created a new computer code that could speed up the design of the complicated magnets that shape the plasma in stellarators, making ...
Mar. 12, 2025 — Researchers gathered emissions data from hundreds of US cities that either conducted a greenhouse gas emissions inventory, or reported they employed ...
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Mar. 12, 2025 — Large, undisturbed forests are better for harboring biodiversity than fragmented landscapes, according to recent research. Ecologists agree that habitat loss and the fragmentation of forests reduces ...
Mar. 11, 2025 — Researchers have discovered that water generates an electrical charge up to 10 times greater than previously understood when it moves across a surface. The team observed when a water droplet became ...
Mar. 11, 2025 — Where there's water, there are waves. But what if you could bend water waves to your will to move floating objects? Scientists have now developed a technique to merge waves in a water tank to produce ...
Mar. 11, 2025 — Microplastics have been found almost everywhere that scientists have looked for them. Now these bits of plastic -- from 1 to 62 micrometers long -- have been found in the filtered solutions used for ...
Mar. 11, 2025 — Cost, technical performance and environmental impact -- these are the three most important aspects for a new type of LED technology to have a broad ...
Mar. 11, 2025 — A new study has investigated one aspect of how the future environmental conditions created by the changing global climate might affect earliest ...
