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What is half-life?
In science, a half-life is the amount of time it takes for half of a substance or entity to undergo some specified process.
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Asked 6/1/2010 8:27:25 AM
Updated 2/20/2016 12:17:24 AM
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Edited by yumdrea [2/20/2016 12:17:04 AM]
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In science, a half-life is the amount of time it takes for half of a substance or entity to undergo some specified process.

Added 2/20/2016 12:17:24 AM
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What is the principle of uniformitarianism?
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Updated 11/17/2015 1:20:05 AM
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Uniformitarianism is the principle or assumption that the same natural laws and processes that operate in the universe now have always operated in the universe in the past and apply everywhere in the universe.
Added 11/17/2015 1:20:05 AM
This answer has been confirmed as correct and helpful.
What are the types of animals in a subarctic climate?
Weegy: domestic livestock and/or wild animals, (More)
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Expert Answered
Updated 8/7/2014 9:47:31 AM
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Animals in a subarctic climate have to be well-adapted to the cold, with extra layers of fat and thick fur. Some of the world's largest hunters live within the Arctic Circle: bears and wolves, and smaller ones such as wolverines, red and arctic foxes, and lynxes. They hunt herd animals such as caribou, moose, elk, reindeer, musk oxen, mountain goats, Dall sheep and deer. There are no reptiles - whose ectothermic metabolism means they cannot adapt to the cold - but there are a host of small mammals: snowshoe hares, beavers, river otters, mice, rats, lemmings, voles and squirrels.
Added 8/7/2014 9:46:45 AM
This answer has been confirmed as correct and helpful.
what is soil profiling?
Weegy: Soil Profile refers to the layers of soil; horizon A, B, and C. If you're wondering what horizon A is, here's your answer: horizon A refers to the upper layer of soil, nearest the surface. It is commonly known as topsoil. [ In the woods or other areas that have not been plowed or tilled, this layer would probably include organic litter, such as fallen leaves and twigs . The litter helps prevent erosion, holds moisture, and decays to form a very rich soil known as humus. Horizon A provides plants with nutrients they need for a great life. The layer below horizon A, of course, has to be horizon B. Litter is not present in horizon B and therefore there is much less humus. Horizon B does contain some elements from horizon A because of the process of leaching. Leaching resembles what happens in a coffee pot as the water drips through the coffee grounds. Leaching may also bring some minerals from horizon B down to horizon C. If horizon B is below horizon A, then horizon C must be below horizon B. Horizon C consists mostly of weatherized big rocks. This solid rock, as you discovered in Soil Formation, gave rise to the horizons above it. Soil profiles look different in different areas of the world. They are affected by climate and other things. ] (More)
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Expert Answered
Updated 4/8/2019 7:10:06 AM
1 Answer/Comment
Soil Profiling can be defined as a vertical arrangement of the soil from the bottom surface downwardly to where the soil meets the underlying rock.
Added 4/8/2019 7:10:06 AM
Confirmed by Sting [4/8/2019 7:13:53 AM], Unconfirmed by Sting [4/8/2019 7:14:05 AM]
what is a water table?
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Updated 11/3/2014 4:42:59 AM
1 Answer/Comment
The water table is the surface where the water pressure head is equal to the atmospheric pressure (where gauge pressure = 0).
Added 11/3/2014 4:42:59 AM
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Confirmed by selymi [11/3/2014 4:57:14 AM]
what is porosity?
Weegy: Porosity is a measure of the void spaces in a material, and is a fraction of the volume of voids over the total volume, between 0–1, or as a percentage between 0–100%. (More)
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Updated 11/21/2014 11:46:25 PM
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