Erosion piles up in low places to form:

soil and sand
lava and soil
magma and silt
sand and lava

soil and sand

Explanation:

hope it's helpful

"i have always loved contemporary art and made it a general goal to work within the field. after a few nonprofit internships at museums and galleries, i decided to try the for-profit art world and was offered a job as the ad assistant at the magazine. i much prefer the pace of the for-profit art community and have stayed with the company for three years, with a promotion to an account manager last spring."

i just did this and got a 100.

b.transmitters send radio waves, and receivers capture radio waves.