When a common type of basaltic lava hardens, it forms aa, which has a. a surface made of cinders.
b. a smooth surface that is wrinkled.
c. a rough, jagged surface.
d. holes that ooze hot water.

Option C, a rough, jagged surface

Explanation:

The varied texture of the volcanic rock is due to the variations in the density and viscosity of the lava flows.

A slow moving basaltic lava has high viscosity and is usually cooler in temperature. When such lava settles to get hardened it forms sharp, jagged edges block.

Smooth surface do not develop in hot lavas that have high concentration of gas.

Hence, option C is correct

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