Atakes place when the sun, earth, and moon are in nearly a straight line with the earth being between the sun and the moon.
corona
lunar eclipse
solar eclipse

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.