What is NOT a clue that a chemical reaction is occurring?* Bubbles forming
Color Change
It's in a controlled lab setting only
Heat Transfer

Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. the winds blow from west to east in jet streams but the flow often shifts to the north and south. jet streams follow the boundaries between hot and cold air. the earth's rotation is responsible for the jet stream as well.

An atom that has fewer electrons that protons is called a positive ion.

The answer is a.  i hope this

The object's initial distance above the groundthe object's initial velocity