At what core temperature does hydrogen begin to fuse to helium? at what core temperature does hydrogen begin to fuse to helium? 3,000 k 100 million k 1 million k 5,800 k 10 million k

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

In 2002, the rare earth elements mine in mountain pass, california was closed because

Balance the following reaction. as2s3 + 9o2 → 2as2o3 + so2