Which of these statements is correct about material 1 and 2? The half-lives of Material 1 and Material 2 are same.

The half-life of Material 2 is one-fourth of the half-life of Material 1.

The half-life of Material 2 is 5 years more than the half-life of Material 1.

The half-life of Material 1 is 5 years more than the half-life of Material 2.

D. The half-life of Material 1 is 5 years more than the half-life of Material 2.

Explanation:

As you can see in the graphs for material 1 to get to 50% it takes 30 years. for material 2 it takes 25 years to get to 50%. Therefor the halflife of material 1 is 5 years more than material 2

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

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.