The largest telescope at Kitt Peak National Observatory is the Mayall 4-meter Telescope. The two Keck telescopes in Hawaii each have a diameter of 10 meters. How much greater is the light-gathering power of one Keck telescope than that of the Mayall telescope

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explanation:

answer: a. same unit

explanation:

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.