Areas such as the san joaquin valley and mexico city have experienced subsidence because a of urban growth that made the area sink b groundwater was overpumped c of a drought that lasted decades d the main rivers were dammed e the sediments were all clay

they required less loading and unloading

explanation:

the shipping container improved shipping because it cut down on unloading time by three weeks, eliminated wasted space, and allowed ships to carry.

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.