ch2 earth surface long qs

Question 1

formation of volcano

Answer 1

magma can rise from a magma chamber in the earths crust through a vent. A vent is a narrow tube in the crust. when magma reaches the surface it is called lava. lava hot ash and rock is thrown into the air as an ash cloud. layer is added to layer until a cone shaped mountain is formed. it continues to flow from a crater at the top.

Question 2

earthquake

Answer 2

earthquakes are sudden vibrations and tremors in the earths crust. when plates collide or slide past each other, there can be a build up of pressure along the fault line. when this pressure is released, it results in an earthquake. The point underneath the surface where the earthquake is the strongest is called the focus. Directly above the focus is the epicentre. Aftershocks are tremors after the earthquake.