41:34

Physical factors and chemical reactions in atmosphere integrated science 1st secondary Egypt شرح وحل

29:26

The concept of sustainability & effects of pollutants integrated science 1st secondary Egypt شرح وحل

48:30

Atmosphere and biological balance integrated science 1st secondary Egypt شرح وحل

54:47

Physical prosperities of water integrated science 1st secondary Egypt شرح وحل

35:20

Revision Chapter1 2ndsec Summary atom atomic theory & Thomson model - second secondary Part1

41:03

Soil composition and profile integrated science 1st secondary Egypt شرح وحل

24:37

Factors effect on Soil quality integrated science 1st secondary Egypt شرح وحل

1:00:09

Pressure and coligative properties of solutions integrated science 1st secondary Egypt شرح وحل