Select all of the answers that apply.

billions of years ago, earth was a very hot place due to

meteorite bombardment
high levels of carbon dioxide and water vapor
earth's strong gravitational pull
cyanobacteria photosynthesis

Earth was bombarded continuously by the remnants of the dust and debris — like asteroids, meteors and comets — until it formed into a solid sphere, pulled into orbit around the sun and began to cool down during the Hellish period (4.5 to 3.8 billion years ago).

 .To know more of this topic, see attached file.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.