I think one of the statement here is erroneously written since A and B is the same statement. It should be that one choice is that "<span>Saltwater freezes at a lower temperature" and this is the correct answer. Saltwater experiences a freezing point depression due to the salt in the solution.</span>
It will start 5 years after the 20s
Just as people are affected by their enviroment, people can modify their environment in a number of ways: ...
Agriculture. People cut down forests and plow grassy plains to creat farms.
Urban Growth. People build towns and cites.
Building of Dams. ...
Energy.