Science Tectonic plates

Convergent boundary

2 tectonic plates that move towards from each other.

Divergent boundary

2 tectonic plates that move away each other.

Transform boundary

2 tectonic plates that slide past each other.

Convection currents

Slab pull

Ridge push

Who proposed continental drift

Who proposed seafloor spreading

What is continental drift

What is seafloor spreading

Chemical layers:

Physical layers

Rift valley

Magnetic striping

How does magnetic striping prove seafloor spreading

Fault

Subduction

Mid-ocean ridge

Evidence for continental drift (4)

Evidence for seafloor spreading (3)

What would occur over 50 years at a divergent boundary? (4)

• New crust formation as tectonic plates move apart.

• Increased volcanic activity due to rising magma.

• Slight shifts in landmasses, creating new oceanic crust.

• Possible minor earthquakes from magma movement.

What would occur over 50 years at a convergent boundary? (4)

• Plates collide, causing small mountain building

• Frequent earthquakes, likely larger in magnitude.

• Formation of deep ocean trenches or mountain ranges.

• Volcanic activity may increase if subduction occurs.

What would occur over 50 years at a transform boundary?

• Lateral sliding of plates causes accumulated stress.

• Earthquakes are common; they can be moderate to large.

• No significant change in landmass size, but ongoing strain.