What evidence is there for scientists to believe Uranus has some internal heat?
a. active volcanoes spewing methane gas and ash
b. convection in the fluid mantle driving the dynamo effect
c. a molten metallic core
d. craters on the surface that are small and filled by lava
e. a severe axis tilt leads to more absorption of heat from the Sun
Question 2
How many moons have so far been discovered orbiting Uranus?
a. 1
b. 5
c. 10
d. 15
e. 30+