Amechanical wave is created when a medium or moves back and forth or up and down.

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

How does friction with the atmosphere affect the speed of an artificial satellite

Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one