Download As air molecules are heated by touching the warm

As air molecules are heated by touching the warm
surface of the Earth, the speed at which the air
molecules move (1.)______________________.
This causes them to (2.) ____________ apart which
means the (3.)_____________ of space that they
occupy increases. That, in turn makes them
(4.) ______________ dense. Since more dense
substances (5.) _____________ and less dense
substances (6.) _________________, the heated air
will (7.) __________________. In the troposphere,
the air temperature gets (8.)__________________ as
you increase in altitude. Cooling of air makes the
molecules speed decrease and they move
(9.) __________________. This means that there is
(10.)__________ space available for water vapor
molecules. As water vapor molecules slow down or
lose kinetic energy they can changes back into liquid
form. This process is known as
(11.) _________________. Cloud droplets form
when water vapor molecules come into contact with
cold (12.) ___________ particles that exist in the
atmosphere. And this is how clouds form.