Which radioisotope is an artificial transmutation?

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

Joe shines white light into a bowl half full of water at an angle of incident of 27.5°. calculate the angle of refraction in the water given the indices of refraction for air and water are 1.00 and 1.36, respectively.

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains