permafrost

Question 1

what is permafrost

Answer 1

it’s ground whose temperature had been 0 degrees celsius of lower for at least 2 years

Question 2

what causes permafrost to melt and what does it release

Answer 2

global warming that releases methane (greenhouse gases)

Question 3

why are houses built on stilts in the north

Answer 3

so the thermal energy from houses doesn’t go into the ground and cause instability