Revision on unit 1&2 primary 4

Mention one use for each the following
1- Graduated cylinder
2 -Graduated tape
3-Sensitive balance
4-Common balance
5-Mercury Thermometer
6-Barometer
7-Anemometer
8-Wind van


The importance of - Weather forecast
ships and boats does not sail during strong wind

Wearing heavy clothes if the temperature is low
car drivers must be slow dowen during foggy morning
G.R
the big star seems small Because they are very far(distance)from u

2-the sun seems bigger to us Because it is nearest star to us
3-We see moon shiny in the sky Because it reflects the sunlight
4-the movement of the shadow Because The earth rotates around its axis
5-Occurrence of day and night Because The earth rotates around its axis
6- Occurrence of 4 seasons Because The earth rotates around the sun
7-Oxygen gas is very necessary Because living organisms need it in respire
8-Rising of sea water due to strong wind