Question

Which planet has a rocky mantle, iron core and very dense atmosphere that is 96.5% poisonous carbon dioxide and 3.5% nitrogen?

Answer 1

"Venus" has all that characteristics. It has a rocky mantle, iron core and very dense atmosphere that is 96.5% poisonous carbon dioxide and 3.5% nitrogen

In short, Your Answer would be "Venus"

Hope this helps!

Answer 2

Venus.

Step-by-step explanation:

Venus is one of the four terrestrial planets in the solar system. It is rocky planet which is similar to earth.

It is similar with the earth in shape and size because of this, it is said said sister of Earth.

The diameter of Venus is 12103 km. The Venus surface is differ from earth as its dense atmosphere contains 96.5% of poisonous carbon dioxide and also 3.5% of nitrogen.