Which statements accurately describe conduction and convection? check all that apply.
only conduction needs matter to transfer thermal energy.
only convection needs matter to transfer thermal energy.
both conduction and convection need matter to transfer thermal energy.
conduction involves collision of particles, while convection involves the movement of a liquid or gas.
convection involves collision of particles, while conduction involves the movement of a liquid or gas.

Both conduction and convection need matter to transfer thermal energy.

Conduction involves collision of particles, while convection involves the movement of a liquid or gas.

Explanation:

There are three ways in which heat is transmitted:

  1. By Conduction, when the transmission is by the direct contact (through collisions).

   2. By Convection, heat transfer in fluids making a current created by less dense fluids floating and more dense fluids sinking (like water or the air, for example).  

  3. By Radiation, by the electromagnetic waves (they can travel through any medium and in vacumm)

Therefore, both conduction and convection need matter to transfer thermal energy (unlike radiation).

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y