What is a lanform for children Select a lesson
 

Constructive landforms
What is a Landform
Landforms created by crustal deformationLanforms created from volcanic activityFormation of landforms from sediment depositionWeathering factor of landformsLandforms created by erosionKinds of landformsFormation of a canyon landformformation of cape and formation of peninsulaFormation of coastline landformsFormation of continental shelf landformsFormation of a delta landformFormation of desert landformsFormation of glaciersHow do islands formHow do isthmus landforms formFormation of mountain landformsHow fo plains formHow do Plateaux landform formHow do sand dunes formHow do valleys formDestructive landforms
SUGGESTED LESSONS
Genetic engineering
Green energy
crude oil
Effects of overfishing
Water shortage
climate change
DeforestationThe ozone layer
Waste management
Wasting foodNatural resources for children

How is a landform created


Landforms formed from Volcanic Eruptions

Volcanic activity is another constructive factor in the formation of landforms. Volcanic action involves the release of molten magma (melted rock) from deep below the earth’s surface. When the molten magma is spewed onto the earth's surface, it is called lava. When lava cools off on the earth’s surface, they solidify and may form land features. This action is responsible for the formations of many spectacular landforms. Some examples of landforms created by volcanic action include lava domes, plateaux, and calderas.

It is important to know the relationship between volcanoes and mountains. A volcano is only a vent (hole in the earth's crust) through which lava spews out. This means a volcano alone is not a mountain. It becomes a mountain when the spewed out lava solidifies around the vent to form a hard, rocky mound around the vent.

How does a volcanic mountain form

Landforms formed from volcanic activity will depend on the kind of volcano it is, or material it produced.

Here are a few important examples of landforms from volcanic eruptions:

Shield Volcanoes:
They form by non-explosive eruptions of low viscosity (more fluid lava) lava. The features of this kind of volcano are its gentle upper slopes and steep lower slopes. Low viscosity material from the vent spreads around quickly before they cool and solidify. As they cool, viscosity increases, causing it to thicken at the edges.

Craters and Calderas:
These are circular depressions that collect rainwater or snowmelt and are created by very explosive and gaseous eruptions. They are formed by a collapse of a volcanic structure. Craters are smaller in size (less than 1km in diameter) and Calderas are larger (between 1km–50km). Examples include Yellowstone Caldera in Wyoming, Long Valley Caldera in eastern California, and Valles Caldera in New Mexico.Landform References PDF

Plateau:
Volcanic plateau diagram for children
A plateau is an elevated portion of the land with a flat surface, and often with steep slopes or cliffs at the one or more sides. It is nicknamed tableland because it looks like a table. They are very common and believed to cover a third of the total land area of planet earthLandform References PDF. Plateaux are formed in many ways On way is when volcanoes erupt small amounts of lava over a long period. The lava is usually low in viscosity and so it easily spreads over a long distance before they harden.

Go backKinds of Natural Resources

Sources:
1. Volcanic Landforms, Volcanoes and Plate Tectonics, Prof. Stephen A. Nelson
www.tulane.edu/~sanelson/Natural_Disasters/volclandforms.htm

2. Dunn, Margery G. (Editor). (1989, 1993). "Exploring Your World: The Adventure of Geography." Washington, D.C.: National Geographic Society. www.nationalgeographic.org/encyclopedia/plateau/

Landform diagrams

How is a landform created