Question 6 (1 point)

Question

Why do stratovolancoes (also called composite) like Mt. Fuji have steep sides at the top and gently sloping sides towards the bottom?

a
This volcano only has thin lava flows that flows quickly and cools in thin sheets.
b
This volcano alternates between lava flows and pyroclastic flows which makes layers of ash, lava and rock. The lava is thick, and flows slowly, hardening and producing steeper sides around the top.
c
This volcano only has pyroclastic flows which shoots ash high in the sky, created a steep slope around the crater.
d
The steep neck and gently sloping sides are present because of convergent boundaries colliding.

Answer 1

The correct answer is:

b This volcano alternates between lava flows and pyroclastic flows which makes layers of ash, lava, and rock. The lava is thick, and flows slowly, hardening and producing steeper sides around the top.

Stratovolcanoes, such as Mt. Fuji, are characterized by their layered structure formed from both lava and pyroclastic materials. The thick lava tends to create steeper slopes at the summit, while the more gently sloping lower parts are formed from the accumulation of various materials during less explosive eruptions.