The Tharsis Bulge is one of the most interesting features on any of terrestrial planet in our solar system. From the follow statements that describe it, decide which ones are true.
1. it actually comprises an enormous single volcanic caldera on the surface of Mars
2. it has resulted in cracking of its planet's crust nearly 1/4 of the way around.
3. it is the youngest surface feature on Venus and may still be geologically active.
4. it is the size of North America and rises 10 km above planet surface surrounding it.