Solve all questions please

1.) Deforestation prevents floods.

2.) When was the steam-powered vehicle invented? 1769.

3.) Witch of the following is not a mass comunication? PostCard.

4.) Proto languange was the beginning of comunication for the humankind.

5.) Videography is the system of representing Vedio Prudoction .

6.) siesmograph is used in meusuring and recording an earthquake.

answer; i believe that they became wealthy from gold and salt in their area, and became powerful by controlling trade in west