The electric lamps Electric lamps are tools that convert electric energy into light energy by passing electricity through them, There are different types of electric lamps, but the most popular of these lamps are...
The volcanoes There are thousands of volcanoes on the Earth’s surface. But sixty-one only of them are active as evidence of the permanent activities and movement beneath the Earth’s crust. The volcano is an...
The earthquake The earthquakes The earthquakes are rapid and successive shakes of the ground which take place one after the other, Every day, the Earth’s crust is exposed to nearly 400 earthquakes, Actually, we...
Mechanical waves are the waves that propagate through a material medium (the solid, the liquid, or the gas) at a wave speed that depends on the properties of that medium. The mechanical waves need...
