Transcript Geography revision - Miss Zee: Geography

Geography revision
Weather, tectonic plates, earthquakes and volcanoes
Where do volcanoes occur
mostly and why?
• Volcanoes occur mostly on or near plate boundaries
• Volcanoes may erupt if a large richter earthquake
occurs.
• there are also more likely to be faults were the
volcanoes are
Location of the pacific ring
of fire
• On or near the plate boundaries
Plate movements
• Converging - pushing
towards each other
• Diverging- pushing away
from each other
• Transform- rubbing against
each other
What is a hotspot?
• A hotspot is a point where magma rises up from the
mantle and forces its way through the crust above.
• A hotspot is in the middle of a plate
3 types of seismic waves
• 1. Primary waves • 2. Secondary waves• 3. Surface waves-
Layers of the earth
• Inner core, outer
core, mantle and
crust
Weather vs Climate
• Weather is short term change in the atmosphere at a
location
• Climate is the average weather conditions that are
measured over a long period of time
Weather symbols
Effects that an earthquake
has on human and natural
environments
• NATURAL- the level of surface may be different
• The surface waves effect the surface
• There maybe cracks in the surface
• HUMAN- no electricity
• Buildings are destroyed
• Homes are ruined
• Lava- magma, or molten rock, that erupts to the
Earths surface.
Definitions
• Crater- the opening on top of a volcano through
which lava erupts
• Magma chamber- when two plate move apart, molten
rock will flow upwards out of the magma chamber
• Subduction- the process by which, when two tectonic
plates collide, one plate slides under another
• Epicentre- the point on the Earths surface directly
above the focus of an earthquake
• Focus- the point within the earths crust where an
Where do you seismic
waves originate?
Focus which later moves on to the epicenter