Tag: geography

Volcanic materials of various sorts are ejected through a pipe and the vent situated at the top of the pipe. The enlarged from of the volcanic vent is known a volcanic crater and caldera.

Stromboli is one of the most active volcanoes on Earth and has been erupting almost continuously since 1932. Because it has been active for much of the last 2,000 years and its eruptions are visible for long distances at night, it is known as the "Lighthouse of the Mediterranean". It is among the world's most visited volcanoes.

Mount Etna is Europe's highest and most active volcano. Towering above the city of Catania on the island of Sicily, it has been growing for about 500,000 years and is in the midst of a series of eruptions that began in 2001.

Lava flows from the volcano. Molten rock materials are generally called magma below the earth's surface while when they come out at the earth's face they are called lava. Lava is very hot and the temperature ranges between 700 to 1200 degrees Celsius.

A volcanic crater is a funnel shaped hollow at the top of the vent. It is formed as lava and gas and ash are blasted upwards from the main vent. Material falls back down to earth around the vent and slowly piles up forming a rim around it. The inside of the crater is kept clear by the force of upward moving material constantly removing any debris which falls there.

Lava is the molten rock expelled by a volcano during an eruption. A lava flow is a moving/outpouring of lava, which is created during a non-explosive effusive eruption. When it has stopped moving, lava solidifies to form igneous rock. The term lava flow is commonly shortened to lava. Although lava can be up to 100,000 times more viscous than water, lava can flow great distances before cooling and solidifying because of its thixotropic and shear thinning properties.

Magma is an extremely hot liquid and semi-liquid rock located under Earth's surface. Earth has a layered structure that consists of the inner core, outer core, mantle, and crust. Much of the planet's mantle consists of magma. When magma flows or erupts onto Earth's surface, it is called lava.

Barren Island is an island located in the Andaman Sea. It is the only confirmed active volcano in South Asia and the only active volcano along a chain of volcanoes from Sumatra to Myanmar.

Humans made remarkable technological progress during the Neolithic period. They became food - producers and started leading a settled life.People no longer depend on hunting , fishing and gathering . Agriculture and animal husbandary took care of their food, with agriculture expansion , early human beings needed pots in which they could store yheir food grains. They also needed pots for cooking , eating and drinking.Pottery was invented during this period.Animals like dogs , cats , cattle, sheep , camels , geese, horses and pigs started out as wild animals. But these animals were tamed out as wild animals.

All the animals that we keep as pet these days, such as dogs, cats , cattle , sheep, camels, geese, horses, and pigs, started out as wild animals. But these animals were tamed into quieter animals by our Neolithic ancestor. Humans benefited by the domestication of animals are as follows; Cows and goats gave them milk and meat , cattle also helped them in ploughing the fields and Dogs gave company and also helped in hunting.

Archaeological evidence from the Neolithic site of Hallur in Karnataka has revealed the presence of domesticated sheep and goat bones.