Volcanic eruptionsb | Most Wonderful Nature

Share Top Five December 20, 2018

Part of the Aeolian Islands off the coast of Sicily, Stromboli is a small volcanic island with several hundred brave inhabitants. Unlike most volcanoes, Stromboli’s is constantly spewing lava fountains, gas and ash. Fascinating for volcanologists, but also great for day-trippers who fancy seeing live lava action.

For natural fireworks, take a boat trip around the island at night. Arrange boat tours from harbors on the north coast of Sicily (Messina, Cefalu, Palermo),More info:cnn

Below are photos and Images you may like:

#10 5 Most Deadly Volcanic Eruptions In Human History – Great Animation,More info:Wise Wanderer

#9 What do volcanic eruptions mean for the climate?,More info:carbonbrief

Having lain dormant for over 40 years, the Calbuco volcano last night erupted twice within the space of a few hours. The blast sent a huge cloud of ash over southern Chile.

Carbon Brief has asked a number of experts what volcano eruptions mean for the climate, and whether or not we can expect this latest event to have global consequences.

#8 Basic concepts about volcanoes and volcanic eruptions,More info:sciengsustainability.blogspot

What are volcanoes?

Volcanoes are openings, or vents where lava, tephra (small rocks), and steam erupt on to the Earth’s surface.

Many mountains form by folding, faulting, uplift, and erosion of the Earth’s crust. Volcanic terrain, however, is built by the slow accumulation of erupted lava. The vent may be visible as a small bowl shaped depression at the summit of a cone or shield-shaped mountain.

Through a series of cracks within and beneath the volcano, the vent connects to one or more linked storage areas of molten or partially molten rock (magma). This connection to fresh magma allows the volcano to erupt over and over again in the same location. In this way, the volcano grows ever larger, until it is no longer stable. Pieces of the volcano collapse as rock falls or as landslides.

How do volcanoes erupt?

Deep within the Earth it is so hot that some rocks slowly melt and become a thick flowing substance called magma. Because it is lighter than the solid rock around it, magma rises and collects in magma chambers. Eventually, some of the magma pushes through vents and fissures in the Earth’s surface. Magma that has erupted is called lava.

Magma can be erupted in a variety of ways. Sometimes molten rock simply pours from the vent as fluid lava flows. It can also shoot violently into the air as dense clouds of rock shards (tephra) and gas. Larger fragments fall back around the vent, and clouds of tephra may move down the slope of the volcano under the force of gravity.

Ash, tiny pieces of tephra the thickness of a strand of hair, may be carried by the wind only to fall to the ground many miles away. The smallest ash particles may be erupted miles into the sky and carried many times around the world by winds high in the atmosphere before they fall to the ground.