Venus's atmosphere is 95% poisonous carbon dioxide and small amounts of nitrogen and reported water vapor. This atmosphere causes Venus to have a powerful Greenhouse effect, which allows the lanet to have very high temperatures reaching 470 degrees celsius and 896 degrees farenheight. The interior of Venus is very similar to Eath's. It has an iron core about 3000 kilometers in radius,  molten ,rocky mantle that makes up most of the planet. Studies show that Venus's crust is a lot thicker and stronger than Earth's. Venus also experiences stress on plate boundries.