Which of the following options is not a way to deal with permafrost?
1. avoid it
2. destroy it
3. preserve it
4. melt it

4. Melt it.

Explanation:

Permafrost can be defined as a very thick and solid layer of the ground that consists of soil, sand and rock and has been frozen for a long period of time which is more than two years.

Permafrost when frozen can be found either or the surface or very deep into the earth layer. Permafrost has also been found to be present in sediments or rocks that are under the sea.

Permafrost comes in various types and they are: Continuous permafrost, Discontinuous permafrost, Sporadic permafrost, Alpine permafrost, and Subsea permafrost.

In Arctic regions where there is a tendency for everywhere to be dry, the presence of permafrost there would help to give the soil the moisture it requires for plants

to thrive and grow.

There are ways we can use to deal with permafrost and they are: preserving it, destroying it or avoiding it completely.

Melting of permafrost is a very harmful thing to do. It has the tendency to destroy or harm the environment as well as the ecosystem.

Permafrost after been frozen for more than 2 years has been observed to contain gases such as methane, hydrocarbons, chlorofluorocarbons e.t.c.

If Permafrost is melted, it will cause a release of these harmful gases which are observed to be green house gases as well and these gases can cause serious harm to the ozone layer as well as the ecosystem at large.

doctrine that the us had the right to expand throughout north america.

the correct answer is c.