Plzz ? ? why is trapped air a good insulator? a. it stops heat transfer. b. it is actually a poor insulator. c. it reduces heat transfer. d. it increases heat transfer.

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

In 1980, alfa romeo introduced the first system to smooth a rough idle caused by ignition and camshaft timing changes.

Need people build a dam to create a reservoir that supplies water a nearby city needs. describe two ways this action will likely affect the water cycle in the local environment. (5 points) worth 20 points