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...
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...
The mechanical waves The mechanical waves are the waves which propagate through a material medium (the solid, the liquid, or the gas) at a wave speed which depends on the properties of that medium....
The electromagnetic waves The electromagnetic waves are formed when an electric field couples with a magnetic field. The magnetic and electric fields of electromagnetic waves are perpendicular to each other and to the direction...
The lunar eclipse The lunar eclipse occurs when the Sun, the Earth and the moon are nearly on one straight line with the Earth in the middle hiding the sunlight from the moon, The...
The solar eclipse The solar eclipse phenomenon occurs when the Moon passes between the Sun and the Earth casting its shadow on the Earth’s surface, where the moon, the Earth and the Sun are...
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