Question

put the following in order of how convection currents in the mantle move.
i. the material that moved up cools and sinks back down into the mantle.
ii. the bottom layer of the mantle material rises and spreads horizontally.
iii. the mantle material near the core is heated
iv. the material nearest to the core becomes less dense.
a iv, iii, ii, i
b iii, iv, ii, i
c i, ii, iii, iv
d iii, i, iv, ii

Explanation:

• First, the mantle material near the core is heated (III).
• Then, the heated material becomes less dense (IV).
• Next, the less - dense material (bottom layer) rises and spreads horizontally (II).
• Finally, the material that moved up cools and sinks back down (I).

Answer:

B. III, IV, II, I