1. Selena has a fire in her fireplace to warm her 20oC apartment. She realizes that she has accidentally left the iron poker (α iron = 1.2 x 10 - 5oC -1) in the fire. How hot is the fire if the 0.60-meter poker lengthens 0.30 cm?

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

hope this ! this is not copied! search it up, it's free of plagiarism!