As particles in a convection current are heated up, what happens to their speed and density? A.) Particles speed up and get closer together, making their more dense.
B.) Particles speed up and spread out, making them less dense.
C.) Particles slow down and spread out, making them less dense.
D.) Particles slow down and get closer together, making them less dense.

As they rise, they transfer their thermal energy to other particles of the fluid and cool off in the process. With less energy, the particles move more slowly, have fewer collisions, and move closer together. This increases their density, so they sink back down through the fluid

Explanation:

explanation: no but i do not usually comment

catya your not at all which answer i've seen you do this on another question!