Download Extra revision sheet Science grade 4 1

Extra revision sheet
Science grade 4
1-Complete
1. The steps of water of water cycle are -evaporation-,-condensation-,andprecipitation
2. -Atmosphere-is a mixture of gases
3. -Evaporation-is when water goes up as water vapor from the oceans
4. -Condensation-is when water vapor changes into tiny drops of water forming
clouds
5. -Precipitation-is when water arrives the earth surface and falls from the sky.
6. -Runoff-is when water collects and move down the side of the mountain.
7. -Groundwater--is when water collects under ground in aquifer.
8. Weather-is the condition of atmosphere.
9. The atmosphere is --600--km thick.
10. -Humidity---is the amount of water vapor in the air.
11. –Air pressure- is the weight of air.
12. Factors affecting air pressure are-Temperature-,-Humidity-,--distance from sea
level13. -Wind----is moving air.
14. Wind travelling from north pole to tropical area (equator) or wind travelling
from south pole to equator are examples of --global----wind
15. Winds happen because of difference in--Temperature--16. Sea breeze and land breeze are examples of --local--wind
17. ---Stratus--are clouds that cover the sky and cause rain
18. --Cumulus--are puffy white clouds that signal sunny and hot weather
19. -Cirrus--are wispy made of streaks that signal cool and nice weather
20. ---Hail--is a form of precipitation that forms in thunderstorm, made of ice layers.
21. --Snow-is a form of precipitation in which water vapor changes directly into ice.
22. Constellation--is a group of stars that makes a picture or a shape in the sky.
23. --Orbit--is the path an object takes around another bigger object.
24. --Rotation-is when earth turns around its axis and it happens once every 24
hours25. -Rotation--- of earth causes day and night
26. -Revolution-is when earth turns around the sun and it happens once every-year27. There are two reasons why there are seasons which are--Revolution-- ,-tilt28. The part tilted of the earth toward the sun is -summer29. The part tilted of the earth away from the sun is --winter-30. The moon takes –one month-to orbit the Earth
31. The moon is bright because it --reflects-sunlight
32. Full moon is when --Earth-is between the sun and ---moon---33. New moon is when --moon-is between the sun and --Earth--34. Phases of the moon are –new moon--,--first quarter--,--full moon-and –third
quarter
35. The –solar system--is made of the sun and all the bodies that revolve around it.
36. A -comet--trails a bright stream behind it (has a tail) in the space.
37. Inner planets are --small,--warm--,--rocky- and has –large --solid core
38. Outer planets are--huge-,--cold--,--gaseous-and has small-solid core
39. Outer planets and inner planets have—solid core-40. –Mars is the red planet
41. Mercury--is the smallest planets
42. --Venus-is the hottest planet
43. --Jupiter---is the biggest planet
44. -Saturn--has thousands of rings
45. ---Uranus-is tilted on its side.
46. --Earth--is the only planet that has life on it
Give Reason to the following
1. There is a succession of day and night
-
- Due to of Earth- rotation around the axis -- - - - - - - - - - - - - - - - -- - -
2. There are different seasons
-
- Due to revolution of earth around the sun and the tilt of the earth- - - - - - - - -
3. There are different phases of the moon
-
- - -Due to orbit of the moon around the earth - - -- - - - - - - - - - - - - - -
4. There is wind
- - - - Due to the difference in air pressure- - - - - - - - - - - - - - - - - - - - - - - - - - - Write under each picture the suitable term
Classic barometer- anemometer- hail - crescent - solar system - thermometer - constellation
Anemometer--Hail---Thermometer
--
-Classic
barometer
--Crescent-
Constellation-
-Solar system-