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Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground e.g. Basalt. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet e.g. Granite.
Extrusive rocks are formed on the surface of the Earth from lava while intrusive rocks are formed from magma that cools with the crust of the Earth.
There are 3 types of rocks. Igneous Igneous is made when magma rises from the mantle. Under the surface ,it slowly cools and hardens. This is known as intrusive rocks . Example Granite. Above the surface , it hits the cool air and hardens . This is known as extrusive rock. Example Basalt. The next rock is called Sedimentary rock .
Rocks formed this way are know as intrusive igneous rocks. Igneous rocks that form when lava reaches the earth's surface are called extrusive. As the lava spreads out on the surface and meets the air, it cools and hardens very quickly. Example of an intrusive igneous rock is granite and an example of an extrusive igneous rock is basalt.
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How acid rain forms: 1. Acidic gases [ Sulphur dioxide and nitrogen oxide ] are released into the atmosphere by factories, etc. 2. Gases get carried by the wind. 3.These gases gets dissol... Read more →. jc geography.
Underground mining allows companies to dig for coal, zinc and lead further into the ground. Large quantities of rock and earth are then brought up from below the surface. Large amounts of dust are also created and can then be carried by the wind. These dust particles can cause many health problems for those who breathe them in. Economic Impact.
The river erodes the landscape using many processes. 1. Hydraulic action The fast-moving water breaks and wears away material from the bed and banks of the river. This process is known as hydraulic action. 2. Abrasion The broken material that...
Source: place where a river begins. Confluence: point where a river joins a larger one. Estuary: part of the river mouth that is tidal. Delta: a fan-shaped area of land found at the mouth of a river. Mouth: place where the river enters the sea. R...
As the river cuts down, the steep sides are attacked by weathering. This breaks up and loosens the soil and rock. The loosened material slowly creeps down the slope because of gravity or is washed into the river by rainwater. The river carries it away. The end result is a steep sided valley that has the shape of the letter V.