1. What are the two sources of thermal energy in Earth's interior?
A. solar heating and gravity
B. combustion and solar heating
C. gravity and radioactive decay
D. radioactive decay and combustion

Start an single atom tab. observe the decay of polonium-211. after each decay, press the reset nucleus button to watch the process again. write a description of alpha decay for po-211

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

What is the mass of 0.46 mol of mgcl2