Physics, 05.07.2019 01:30 sierravick123owr441

Apex: which of these minerals and mineral resources is composed of the remains of plants that live and died millions of years ago? a. petroleum b. salt c. coal d. aluminum

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Answer from: SKYBLUE1015

Option (C)

Explanation:

The coal is an organic sedimentary rock. These are formed from the dead remains of plants that were buried millions of years back.

In order to form coal, the tropical region is the most favorable place because it is the region in which maximum amount of sunlight and rainfall occurs. As a result of which the plants grow in a significantly large amount. These plants when died. they were decomposed and buried under the earth's surface. With the increase in time, more plants and trees were accumulated, which over a long period of time, turned into coal. It is mostly comprised of carbon in association with hydrogen, oxygen, sulfur, and nitrogen element.

Hence, the correct answer is option (C).

Answer from: Quest

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Answer from: Quest

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

$_a^z\textrm{x}\rightarrow _{a-2}^{z-4}+_2^4\alpha$

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

$_a^z\textrm{x}+_{-1}^0\textrm{e}\rightarrow _{z-1}^a\textrm{y}$

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases $\gamma -radiations$ . this process does not change the mass number.

$_a^z\textrm{x}^*\rightarrow _a^z\textrm{x}+_0^0\gamma$

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as $\beta ^+$ -decay. in this the mass number remains same.

$_a^z\textrm{x}\rightarrow _{z-1}^a\textrm{y}+_{+1}^0e$

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

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