How do geologists study direct evidence of earth’s interior? 1. by collecting core rock samples 2. by measuring seismic wave activity 3. by analyzing how living things survive 4. by recording changes in climate patterns

1. by collecting core rock samples

Explanation:

Geologist obtain direct information about the interior of the earth by carrying out core rock sampling.

The rocks contained in the core used gives a better view as to the nature of the rock found at a particular depth in the earth. Core rock sampling involves the use of a drilling machine that has been built and designed for that purpose. As the drill goes through the earth, a core barrel helps collect intact samples of rock layers when the bits penetrates.

There is limit to which core rock sampling can be used to investigate the earth's interior due to the temperature and pressure in the interior. High temperature and pressure easily damages drill bits.

Other methods used to sample the interior of the earth are indirect. Such example is the use of seismic waves.

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.