Why do stratovolancoes have steep sides?

a
Their mass produces heavy gravitational force that pulls the lava into the sides to cool
b
Their lava is very thick and therefore flows slowly, hardening and producing steeper sides
c
The lava of stratovolcanoes is made of minerals that cool quicker than other materials
d
Volcanic pressure makes the lava flow quickly

1 answer

The correct answer is b. Stratovolcanoes have steep sides because their lava is very thick and therefore flows slowly, hardening and producing steeper sides.