BIG IDEA PROJECT
What caused Mars atmosphere to disappear?
My theory is heat over long periods of time eventually eroded it away.
What caused Mars atmosphere to disappear? Well scientists believe that the loss of Mars global magnetic field caused Mars atmosphere to disappear. The loss of Mars magnetic caused the water and the rest of the atmosphere got vacuumed into space! Now only blotches of the atmosphere disappear.
Mars Journey through time
This is what Mars may have looked like 4 billion years ago to today
I found my info on popular mechanics.com