What damages can earthquakes cause?

A weak earthquake-up to an intensity of 4.0 on the Richter scale-hardly causes any damage. Earthquakes with stronger intensities can cause cracks in buildings. They move the foundations of buildings, cause houses to collapse, and lead to landslides....

How do we measure the intensity of earthquakes?

The intensity of an earthquake is measured by recording the tremors of the Earth's surface with a 'seismograph'. These tremors appear when the earthquake waves reach the surface of the Earth. Such a seismograph consists of a large,...

Where do earthquakes occur?

Earthquakes occur mainly at the borders of the plates, where two plates slide past each other. Most earthquakes occur in the Himalayan region. The actual seismic center, the 'hypocenter', lies deep below the surface of the Earth. The...

Why does the Earth tremble sometimes?

The moving tectonic plates, in which the uppermost layer of the Earth is divided, not only collide at many places but also often slide past each other. This causes friction and leads to problems once in a while....

Where are volcanoes found?

Volcanoes are found primarily at the borders of the plates, where the oceanic Earth's crust submerges below another plate, melts in the depth, and magma rises. This is generally the case all around the Pacific Ocean. Here, the...

Why do people live near volcanoes?

Farmers prefer to settle near volcanoes because the soil is very fertile due to the lava and volcanic ash deposits. When the volcano erupts, people leave the place for some time, and return to the risk zone after...

How can we predict volcanic eruptions?

Because volcanoes are highly erratic, it becomes very difficult to predict volcanic eruptions. But there are ways of saving lives. Early tremors and earthquakes are often signs of a volcanic eruption-gases are emitted and the volcano expands by...

When do volcanoes become dangerous?

We can call a volcano dangerous only when it causes damage to human life. For instance, if a volcano erupts on the almost uninhabited East-Asian peninsula of Kamchatka, it is hardly reported in the news. But, if a...

Why do we have different types of volcanoes?

Since the material coming out of the Earth's core is different in different areas, the resultant changes are also different If the magma is very hot, more than 1000'C, it is dark, thin and mostly flows quietly The...

How are volcanoes formed?

Volcanoes are natural phenomenon that occur everywhere, but some places are more prone than the others. The molten rock and gas in the mantle called magma pushes its way upwards and pours to the surface through cracks in...