divergent plate boundaries

Question 1

step 1

Answer 1

plates move apart , the crust stretches and cracks develop

Question 2

step 2

Answer 2

the decrease in overlying pressure causes parts of the underlying mantle to melt , forming magma

Question 3

step 3

Answer 3

magma contains dissolved gases and is less dense than the surrounding materials

Question 4

step 4

Answer 4

magma rises through the cracks and erupts as lava . this causes a volcanic eruption

Question 5

step 5

Answer 5

as more lava erupts , cools and solidifies over time , a volcanic cone develops