Answer to Question 1
Sunlight filters down through the clouds and warms the surface, but heat cannot escape easily because the atmosphere is opaque to infrared radiation. Traces of sulfur dioxide and water vapor help trap the infrared, but it is the overwhelming abundance of carbon dioxide that makes the greenhouse effect on Venus much more severe than on Earth.
Answer to Question 2
Volcanism around the ring of fire is caused by the motion of the tectonic plates, and are composite volcanoes. On Venus, there are no plate tectonics so the volcanoes are shield volcanoes, the type produced by hot-spot volcanism.
The Sun is the nearest star to Earth.
The Interiors of Earth and Mercury
Craters on Venus
The Arctic is warming faster than any other region on Earth
The gap between the projected level of greenhouse gas emissions
When viewed from the Earth, Venus subtends an angle of about 1 arcminute (1/60°) when it is at ...