If DB=2x-4 and PB=2x-9, find PD

Trenches occur at divergent plate boundaries. a. True b. False

describe how Antartica's qualities and explain why this unique continent would attract scientific study.

The americas are in the?

Largest country in the Iberian peninsula

Which animal lives in the hydrosphere and lithosphere

Where on Earth are organisms exposed to unusually high amounts of toxins, and why does this occur? a. In the North Pole and South Pole because of prevailing ocean currents, as well as the fact that deposition exceeds evaporation at the poles b.

By looking at the crust, can you tell of it is moving?

Astronomers claim to have a reasonable model for interior structure of Jupiter. What is the observational basis for this model? Does it make any predictions that have been put to observational tests?

Why temperature increases with the depth of the earth?

How is the cross sectional shape of a glacial valley different from a valley formed by stream erosion?