Some mountains are volcanoes, and some volcanoes are mountains, but not all mountains are volcanoes, and not all volcanoes are mountains. For a mountain to be a volcano and a volcano to be a mountain, it must be formed from magma and volcanic materials from below the Earth's surface.
D. Increased life expectancy
Answer:
Explanation:
y2-y1 over x2-x1
-1+1 over 2-4
0/-2= m=0
y=mx+b
-1=0(2)+b
-1=0+b
b=undefined
so basically the equation is undefined so you can say x=to whatever number
Answer:
the answer is D: Cenozoic Era
They allow magma to burst between cracks, and they cause blocks of rock to seperate and form new plates.
