Grade 4CONGRATULATIONS YOU HAVE FINISHED THE REVISION SHEET
(from page 20 to 22)
HW is answering the model exam
Is the amount of water vapor in the air.
Is the area where two air masses meet .
3- Air mass:
Is a huge body of air that has nearly the same temperature and humidity.
Are feathery clouds that form high in the atmosphere when water vapor turns into tiny crystals of ice .
Are flat layers of clouds that form close to Earth's surface.
2-Cold front :
It often brings strong winds and brief, heavy precipitation. It moves faster than warm fronts. It doesn't last for a long time .
They usually move more slowly than cold front . They affect weather over larger area. They bring steady long-lasting precipitation .
Q.3.GIVE REASON ;
1-Because air masses contain the water vapor that evaporates from the area below them so more water vapor will be evaporated from water than from land .
2- Because the density of cold air is greater than the density of warm air .
Q.4.TRUE OR FALSE :
4-f .from west to east
2-cool or cold, warm or hot.
3-strong winds ,precipitation .
7-cumulus,stratus and cirrus.
8-thick ,puffy ,good or fair ,high .
9- flat , close
10-feathery , high , tiny crystals of ice .
THANK YOU FOR YOUR EFFORTS