Which characteristic describes an old river? A. Has no meanders B. Has a low stream gradient C. Has no tributaries D. Is near headwaters

Compared with the amount of ice that existed during the last glacial maximum, how much exists today?

Some regions along the plane of the Milky Way appear dark because A) there are no stars in these regions. B) stars in these regions are hidden by interstellar gas. C) stars in these regions are hidden by interstellar dust grains.

Why does convection rainfall occurmost in the equatorial region?

What is the name of the riverthat flows through the center of italy?

Which renewable resources could become a non renewable resource if used faster than earths ability to replenish its supply?

how do air masses affect the weather?

What is a problem Natives in both Bolivia and Peru face?

When is the Earth said to be at perihelion?

Occurs when an area's resources are used up faster than they can be replaced.

1. Why is air pollution a health threat? How is it measured? 2. Why is global warming so controversial? What is causing it? 3. What is acid deposition? How is it damaging?