How do scientists know where the natural resources are without digging?

The Earth’s natural resources include air, water, soil, minerals, plants, and animals. Conservation is the practice of caring for these resources so all living things can benefit from them now and in the future. Ninety-seven percent of Earth’s water is salty ocean water and another two percent is trapped in Earth’s ice caps and glaciers. The precious one percent that remains must be used wisely. Drip irrigation, seen here in action on an Israeli farm, can cut agricultural water demand by seventy percent—yet it’s used on only 2 percent of the planet’s irrigated cropland.

Explanation:

its b i looked it up hope u get it right wish u luck

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."