Which of the following describes nuclear fusion? (2 points) it fuels nuclear power plants. it involves splitting of the nucleus. it involves the combining of nuclei. its chain reactions can be initiated by neutrons.

It involves the combining of nuclei.

Explanation:

The two common nuclear reactions are

a) Nuclear fission : which involves breaking of a larger nucleus by sub atomic particles which generate some more sub atomic particles and the reaction continues as chain reaction.

The fission also results in formation of smaller daughter nuclei.

Nuclear power plants work on this reaction.

b) Nuclear fusion is combining of two nuclei to give one bigger nucleus.

This this involves combining of nuclei.

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.