So the Map 0f the World
looks like a jigsaw puzzle.
What is the quickest, most
efficient way to assemble a
jigsaw puzzle?
•
•
•
•
FIRST - Find Corners
SECOND - Assemble Sides
THIRD - Use Picture
FINALLY, When you have only blue
sky pieces left use edges of inside pieces.
How can we assemble
the World Puzzle?
• Are there corners
• Are there straight sides?
What do we have for a
picture?
• 1. Rocks and fossils
• 2. Mountain Ranges
• 3. Glaciers
What about the edges of
individual puzzle pieces
(= plates of the Earth’s crust)
• Are edges of continents edges of plates?
• Sometimes yes; Sometimes no
• How do we find edges of plates that aren’t
edges of continents?
• What happens when two edges rub against
each other?
• EARTHQUAKES!
How do we know where
earthquakes happen?
• What if the earthquake happens
where nobody is nearby?
• What if the earthquake happens in
the middle of the ocean?
So, Where Was the Earthquake?
You Need Three Seismograph Stations!
Epicenter v.s. Focus
• Focus is where the movement and scraping
actually happened. This may have been
underground!
• Epicenter is the place on the surface
above the focus.