Caldera is a very large it depression at the top of some volcanoes do.
Hope it helped you.
-Charlie
Answer:
Longitude is measured by imaginary lines that run around the Earth vertically (up and down) and meet at the North and South Poles. These lines are known as meridians. Each meridian measures one arcdegree of longitude. The distance around the Earth measures 360 degrees.
Answer:
naomi ganga program as project to clean the rover ganga
I know this might be late, but the answers are glaciers, underground, rivers, and streams. Hope that helps:-]