Answer: a crack forms in the oceanic crust
Explanation:
1) F (Tien Shan is a mountain range)
2) T
3) F
4) F (Karakum is a desert)
5) T
Dead zones are hypoxic (low-oxygen) areas in the world's oceans and large lakes, caused by "excessive nutrient pollution from human activities coupled with other factors that deplete the oxygen required to support most marine life in bottom and near-bottom water.
The Earth gets its heat from the sun.
