the disks of spiral galaxies appear blue because:
spiral galaxies are still undergoing star formation
Hope this helps:)
Answer:
a map is a model
Explanation:
maps are models. I know it is hard to believe. maps can have many things like land forms and roads and rivers and everything else to show us the land.
Answer:
land runoff, precipitation, atmospheric deposition, drainage, seepage or hydrologic modification.
Explanation:
I hope this is the answer you were looking for!
<span>Sinkholes, especially like the one that occurred in Mexico City, are often sign that the water reservoir is being depleted. Usually, the water underneath the ground helps stabilize it, however if there is suddenly open space or a cavern, it can collapse on its self causing a sink hole. This could also happen from fracking and drilling.</span>
