When a fluid is heated, what changes occur? it becomes more dense and begins to rise. it becomes less dense and begins to rise. it becomes more dense and begins to sink. it becomes less dense and begins to sink.

In which environment would primary succession occur? a forest with a few remaining trees after a recent wildfire an area of exposed rock after a glacier melts away beach that is exposed to the air at low tide an abandoned baseball field in a small town

Particles vibrate in a rigid structure and do not move relative to their neighbors.

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided