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just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project
one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as
answer - d) ultraviolet radiation.
violet / 380–450 nm / 668–789 thz
violet is number 1 in the chart of visible light.
the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.
so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers
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