Class 6

Solution. An earthquake is a sudden, violent movement of a portion of the earth’s crust caused by a disturbance under the earth’s surface. Concept: Natural and Manmade Disasters.

Land shaking, surface faulting, ground collapse, and, less frequently, tsunamis are all consequences of earthquakes. Earthquakes can lead to: Death of humans and animals. Buildings, lakes, and bridges have all been destroyed. Landslides and Floods, Tsunamis.

The tectonic plates are always slowly moving, but they get stuck at their edges due to friction. When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth’s crust and cause the shaking that we feel.

There are four different types of earthquakes: tectonic, volcanic, collapse and explosion. A tectonic earthquake is one that occurs when the earth’s crust breaks due to geological forces on rocks and adjoining plates that cause physical and chemical changes.

n earthquake is what happens when two blocks of the earth suddenly slip past one another. The surface where they slip is called the fault or fault plane.

the Pacific OceanThe Ring of Fire, also referred to as the Circum-Pacific Belt, is a path along the Pacific Ocean characterized by active volcanoes and frequent earthquakes. The majority of Earth’s volcanoes and earthquakes take place along the Ring of Fire.

Without volcanoes, most of Earth’s water would still be trapped in the crust and mantle. Early volcanic eruptions led to the Earth’s second atmosphere, which led to Earth’s modern atmosphere. Besides water and air, volcanoes are responsible for land, another necessity for many life forms.

According to the Smithsonian Institute’s Global Volcanism Program, the median length of time for a single eruption is seven weeks.

Nearly 4000 feet below the surface of the Pacific Ocean – in an area between Samoa, Fiji and Tonga – the West Mata volcano was discovered.

Even though Australia is home to nearly 150 volcanoes, none of them has erupted for about 4,000 to 5,000 years! The lack of volcanic activity is due to the island’s location in relation to a tectonic plate, the two layers of the Earth’s crust (or lithosphere).