Volcanoes and Earthquake
... and Earthquake
1. What is the definition of a volcano?
A volcano refers to a conical hill or a mountain that has a vent or crater through which gases, lave, hot vapor, and rock fragments have left the interior of earth due to eruption (Gill, 2009).
2. List the layers of the Earth, from the crust to the core, as they are classified by chemical composition and briefly describe the composition of each layer.
i. The crust, which consists of alumino-silicates and other chemical compounds, is the outermost layer of the Earth.
ii. The mantle, which consists of ferro-magnesium silicates, is the middle layer of the Earth.
iii. Core, which consists of an alloy of iron metal and nickel, is the innermost ...