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Georgia [21]
3 years ago
15

Which of these rocks forms from lava that cools very quickly?

Chemistry
1 answer:
den301095 [7]3 years ago
4 0

The answer is D. obsidian. Or at least I think it is. Just guessing based off me playing Minecraft 6 years ago haha

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Why is it commonly believed that carbon dioxide is responsible for global warming? Select 2 options.
monitta

Answer:

Carbon dioxide levels in the Earth's atmosphere have been steadily increasing.

Carbon has a longer average lifetime in the atmosphere.

Explanation:

Today the level of carbon dioxide is higher than at any time in human history. Scientists widely agree that Earth’s average surface temperature has already increased by about 2 F (1 C) since the 1880s, and that human-caused increases in carbon dioxide and other heat-trapping gases are extremely likely to be responsible.

The lifetime in the air of CO2, the most significant man-made greenhouse gas, is probably the most difficult to determine, because there are several processes that remove carbon dioxide from the atmosphere. Between 65% and 80% of CO2 released into the air dissolves into the ocean over a period of 20–200 years.

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3 years ago
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Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.
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The answer to this question would be: 3.125%

Half-life is the time needed for a radioactive molecule to decay half of its mass. In this case, the strontium-89 is already gone past 5 half lives. Then, the percentage of the mass left after 5 half-lives should be:
100%*(1/2^5)= 100%/32=3..125%
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Any thing that occupied volume and mass in air is known as matter

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