A. CH4 or methane which is a chemical compound
Answer:
Protium
Explanation:
Isotopes -
For some elements , there are various forms possible , which have different number of neutron and same number of protons , are referred to as the isotopes .
The three isotopes possible for the element hydrogen are -
Protium , Deuterium and Tritium .
Where ,
- Protium has one electron , one proton and zero neutron.
- Deuterium has one electron , one proton and one neutron.
- Tritium has one electron , one proton and two neutron.
The most abundant isotope observed is Protium , with 99.98% abundance.
Answer: Heat is removed from a gas, and the substance becomes a liquid.
From the above statement, John can infer that the rock underwent metamorphism and also is not altered by heat or pressure.
<u>Explanation</u>:
- Metamorphic rock is an igneous sedimentary rock and although when put through heat the rock becomes hot but does not alter its shape or melt. If the rock melts then it is only an igneous rock and not a sedimentary one.
- During metamorphism, the chemical and the mineral content of prolith are changed due to changes in the environment based on physical and chemical conditions.
- Even though the rocks remain solid, fluid is present between the macroscopic spaces.
- This gives "The Geologist" accurate information of what happens beneath the earth during the formation of mountains.
- Metamorphic rocks are like probes that go down the earth and comes back giving information of what happens underneath the surface.
