Has anyone done this lab before. not sure what happens in the last column. you : )

True or false, the three major scales used to measure earthquakes are mercalli scale, richter scale and magnitude scale

Gymnast always perform on padded mats. how does the mats protect the gymnast

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line