How many seconds would it take an echo sounder's ping to make the trip from a ship to the Challenger Deep (10,994 meters) and back? Recall that depth = 1/2 (1500 m/sec × Echo travel time).

Elevation variations in the land's surface might best be represented by a(n)

A. topographic profile. B. outcrop. C. geologic map.

Which one of the following principles of smart-growth will most likely result in less commuting for all residents?

A) Having states purchase open spaces B) Setting physical boundaries on urban sprawl C) Building new homes and stores on existing abandoned or brownfield urban properties D) Promoting the integration of homes, stores, light industry, and professional offices

Match the term with the appropriate phrase. charged atoms due to the gain or loss of one or more electrons

-hydrogen bonds -electrons -atoms -covalent bonds -ions

The ________ and Fold were formed as a result of contact between the African, Arabian, and Eurasian plates at the center of the region

A) Atlas Mountains B) High Yemen Mountains C) Zagros Mountains D) Taurus Mountains E) all of the above