Earth's outer shell is divided into tectonic plates that slowly move over the mantle below. Plates interact at boundaries where they either converge and collide, causing volcanoes and earthquakes, diverge and form rift valleys and ocean ridges, or slide past each other along transform boundaries, also producing earthquakes. The movement of these plates over geological time scales shapes the earth's surface features and geography.
2. What are tectonic plates?
Plate tectonics
is the theory
that Earth's
outer shell is
divided into
several plates
that glide over
the mantle, the
molten rocky
layer above the
core.
Plates move only 1-10 centimeters per year
3. How do the plates move?
Tectonic plates interact at locations
called plate boundaries
There are three types of movement at
plate boundaries
4. Three Basic Types of Plate Boundaries
Divergent
Convergent
Transform
USGS Graphics
Using hands to show relative motion
5. What happens to the land where
the plate boundaries move?
Convergent
boundaries are
where plates
collide - Mountains,
earthquakes, and
volcanoes form
where plates
collide.
6. What happens to the land where
the plate boundaries move?
Places where
plates are coming
apart are called
divergent
boundaries. Rift
valleys and ocean
ridges form at
these boundaries
7. What happens to the land where
the plate boundaries move?
Places where plates slide
past each other are called
transform boundaries. The
sliding motion causes
earthquakes.
8. Let’s sing about it
Plates are the crust,
Heat from the Core,
We got the whole world looking for more,
The plates converge,
Or they diverge,
Or they slide past, past, past, past, past each other -
transform
Mountains, trenches, Earthy-Earthquakes,
These things can happen when the crust breaks.
The plates converge,
Or they diverge,
Or they slide past, past, past, past, past each other -
transform