DO NOW:Make a list of things you know that move or grow very slowly
How fast do they grow?
• Snail: 6 cm per minute• Tree Growth: 100 cm – 1000 cm per year (up
to 18 feet per year)• Hair: 1.25 cms per month• Fingernails: 2.3 cms per year (23 millimeters)• Staglagtites: 10 cms per 1000 years
• TECTONIC PLATES: 2.5 cms – 15 cms per year
Plate Boundaries
3 Types of Plate Boundaries
• No plate can budge without affecting the other plates surrounding it.
• As the plates move, they collide pull apart, or grind past each other producing changes in the Earth’s surface.
Divergent Boundary• A divergent boundary occurs when two plates
are moving apart• Magma rises to fill the gap
Rift Valleys and Mid-Ocean Ridges
Eventually, Rift Valleys become Mid-Ocean Ridges
Convergent Boundaries
• A convergent boundary occurs when two plates collide (run into each other)
Convergent Boundaries• The place where two
plate boundaries come together or converge is called a convergent boundary
• A collision is when two plates hit each other—the density of the crust determines which plate goes under the other one
Transform Boundary
• A transform boundary occurs when two plates slide past each other
Exit slip
• 1) Diverging a) Slding past each other
• 2) Transform b) Coming together• 3) Convergent c) moving apart