What was the significance of collisions of dust, rock, and ice during earth’s formation?
a. to modify the density of materials present on earth
b. to facilitate heat absorption from the surrounding space
c. to blow away a strong burst of particles from the first atmosphere
d. to harden materials to form different parts of earth’s layers

Robert wants to know which fertilizer will work the best for his grass. what can he do to explore this inquiry?

How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home.what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point