What is Volcano give two causes of eruption Class 8?
Answer: Volcano is an opening on the earth crust, in the form of lava which emits molten magma, rock pieces, gases and steam on the surface of the earth. The two causes of eruptions are, the break up of radioactive minerals under die bottom of earth and the movement of plates due to eternal heat.
What are the two causes of volcanic eruption?
Although there are several factors triggering a volcanic eruption, three predominate: the buoyancy of the magma, the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber. What follows is a brief description of these processes.
What are the causes of a volcanic eruption?
Volcanoes are formed by eruptions of lava and ash when magma rises through cracks or weak-spots in the Earth’s crust. A build up of pressure in the earth is released, by things such as a plate movement which forces molten rock to exploded into the air causing a volcanic eruption.
What happens during an eruption?
On Earth, the lava comes up from the mantle (which is the layer under the surface). Once there’s enough molten rock — called magma — and enough pressure on it, a volcanic eruption occurs. In other places, lava, gases and ash flow out through vents. They can eventually create become cone-shaped hills and mountains.
What are the parts of Volcano?
The main parts of a volcano include the magma chamber, conduits, vents, craters and slopes. There are three types of volcanoes: cinder cones, stratovolcanoes and shield volcanoes.
Do you think volcanic eruption is possible to happen?
ANSWER. First and foremost volcanic eruption is possible to happen, because volcanoes have holes called vents, this is where magma bursts out to kill people and wreak havoc.
What are the two types of volcanoes?
Strictly speaking there are two broad types of volcano – a stratovolcano and a shield volcano, although there are lots of volcanic features that can form from erupted magma (such as cinder cones, or as lava domes) as well processes that shape volcanoes.
What is volcano and its types?
There are three main types of volcano – composite or strato, shield and dome. Composite Volcanoes. Composite volcanoes, sometimes known as strato volcanoes, are steep sided cones formed from layers of ash and [lava] flows. The eruptions from these volcanoes may be a pyroclastic flow rather than a flow of lava.
What are the 4 layers of the earth?
The structure of the earth is divided into four major components: the crust, the mantle, the outer core, and the inner core. Each layer has a unique chemical composition, physical state, and can impact life on Earth’s surface.
What happens during a volcanic eruption What do humans do to reduce its impact?
PLANNING. One of the most effective ways of reducing the risk of a volcanic eruption is having an evacuation plan. This involves ensuring evacuation strategies are in place along with emergency shelter and food supplies being planned for.
What is Earth’s thinnest layer?
Inner core
What are the types of volcano?
Geologists generally group volcanoes into four main kinds–cinder cones, composite volcanoes, shield volcanoes, and lava domes.
What are the causes and effects of a volcanic eruption?
They can cause rain, thunder and lightning. Volcanoes can also have long-term effects on the climate, making the world cooler. Fast-moving lava can kill people and falling ash can make it hard for them to breathe. They can also die from famine, fires and earthquakes which can be related to volcanoes.
What are the negative impacts of volcanic eruption?
Health concerns after a volcanic eruption include infectious disease, respiratory illness, burns, injuries from falls, and vehicle accidents related to the slippery, hazy conditions caused by ash. When warnings are heeded, the chances of adverse health effects from a volcanic eruption are very low.
What is the most dangerous type of volcano?
stratovolcanoes
What are the 6 layers of the earth?
Crust, mantle, core, lithosphere, asthenosphere, mesosphere, outer core, inner core.
How do volcanoes affect climate?
The gases and dust particles thrown into the atmosphere during volcanic eruptions have influences on climate. Most of the particles spewed from volcanoes cool the planet by shading incoming solar radiation. The cooling effect can last for months to years depending on the characteristics of the eruption.