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Geography

Geography(planet earth)

QuestionAnswer
what is the equator? The imaginary line running halfway between the poles
How often does the earth rotate on its axis? Every 24hours
At what angle is the earth tilted at? 23 1/2 degrees
How often does the earth orbit the sun? Every 365 1/4 days
How much of the earths surface is covered by water? 2/3
Explain the structure of the earth Crust, mantle, outer core and inner core
What is magma? The rock in a molten state witch flows around in a slow-moving current
What do plates move around in? Convection currents
What are fold mountains? The outcome of plates in collision. E.g the Rocky Mountains, North America
What are volcanoes? The outcome of plates in separation. E.g Hawaii
What are mid-ocean ridges? The outcome of plates in separation. E.g the Pacific Ring of Fire
What is Pangaea? When all the land on the earth was once a supercontinent
Name 3 major plates on the earth The African plate, the American plate, the Australian plate
What are earthquakes? The result of plates in collision or when plates slide past each other. It is a violent shaking of the earth
What is the focus? The point within the crust where to earthquake occurs
What is the epicenter? The place on the surface found directly above the focus
What are aftershocks? Small tremors after the earthquake
What is the Richter scale? The item used to measure the force of the earthquake
What a seismometer? The instrument that identify's tremors on the crust
Give three effects of earthquakes Loss of life, damage to buildings, gas and electricity damage
What are Tsunamis? Giant tidal waves that are generate as a result of an earthquake occurring on the ocean floor
What is an active volcano? A volcano that erupts regularly, e.g Mount St Helena, USA
What is a dormant volcano? A volcano that hasn't erupted in a long time but may erupt again, e.g Cotopaxi in Peru
What is an extinct volcano? A volcano that hasn't erupted in recorded history, e.g Slemish Mountain ,Ireland
List three advantages of volcanoes Tourism, creation of new land and building material
Created by: Chimozukee
 

 



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