In 1 the options are Igneous

Metamorphic

Sedimentary

The second options are

Melting

Sedimentation

Weathering

I'm a helping hand yeah, thanks

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

age range would be the answer