Why did geologists set fire to “the door to hell”

The Darvaza gas crater know as the "Door To Hell" is a natural gas crater. Geologists intenyionally set fire to it

Explanation:

Geologists intentionally set fire to it in order to prevent the spread of methane gas

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.

the answer is definitely c.