What is happening when scientists explore the world around them?

Explanation:

When the scientists explore the world around them, new discoveries are being made, new species are discovered. The scientists find solution to different problems. They explore the unexplored and find answers to many unsolved questions. The scientists quest is fulfilled when they explore the world to learn new things,. They gifts the mankind with their knowledge and learning.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

me and my friend did 2