a volcano is a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.
There are three main types of volcano - composite or strato,shield and dome. 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.
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Water isn't wet by itself, but it makes other materials wet when it sticks to the surface of them.
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Organisms are classified into different groups in order to identify any specific organisms. ... Classification also helps us in understanding each individual organisms and their differences and similarities with other organisms helps us to understand the evolutionary process in a better way.
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A scientist developing vaccines for diseases would have taken many specialized classes in immunology.