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diamong [38]
3 years ago
14

Which of these materials will decay the fastest to one-fourth of its original amount?

Geography
1 answer:
gtnhenbr [62]3 years ago
6 0
The elements listed in the choices are radioactive materials. These materials are very unstable because of the high neutron-to-proton ratio in the nucleus. Because of this, they spontaneously undergo nuclear reactions by giving off sub-particles in order to lower the ratio. They emit radiation in the form of alpha, beta or gamma. 

Half-life is the length of time it needs to completely react half of the original amount. For example, it would take Bismuth 60.5 seconds to use up half of its amount. Therefore, the lower the half-life the faster the reaction is and the lesser the residual amount will be. With that being said, the answer would be Bismuth because it only takes seconds.
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Tropical grasslands with scattered trees and seasonal rainfall
sergey [27]

Answer:

Savanna is grassland with scattered individual trees.

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Explanation:

Savannas of one sort or another cover almost half the surface of Africa (about five million square miles, generally central Africa) and large areas of Australia, South America, and India. Climate is the most important factor in creating a savanna.

8 0
3 years ago
The swamps that were turned into coal over time grew at the end of this
Tems11 [23]

Answer:

Paleozoic

Explanation:

The Paleozoic Era is a geologic era that lasted from 541 to 251.902 million years ago. This is divided into six geologic periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. The swamps that were turned into coal over time grew during the Carboniferous period, which expands from 358.9 million years ago to 298.9 million years ago. The period is well-known because many coal beds were formed during that time period. During the Carboniferous, terrestrial animals were well-established. It ended with a minor extinction event known as the Carboniferous rainforest collapse.

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3 years ago
Settlers who grew just enough crops to support themselves likely lived in which region
natali 33 [55]
Settlers who grew just enough crops to support likely lived in the North.

Hope this Helps!

8 0
3 years ago
hey could someone help me please this is pretty easy you just need to fill in the information with made up things but i gotta wo
Marrrta [24]
No,
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Locate 34 degrees,18 degrees
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