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

european union policies. the eu's long-term objective is to achieve levels of air quality that do not result in unacceptable impacts on, and risks to, human health and the environment. eu policies aim to reduce exposure to air pollution by reducing emissions and setting limits and target values for air quality.

the main environmental problems in western europe were: energy production/acid rain, nuclear power/waste, air pollution/climate, heavy metals, pesticides, water pollution, solid waste, and unforeseen accidents. many environmental problems are common to most european countries.

i think the answer is g1

hope i

-lavira: )