1
The thinnest layer of the Earth
Crust
There are ______________ main layers of the Earth.
3
What are the two types of crust?
1. Oceanic crust
2. Continental crust
What are the 3 types of Plate Boundaries?
1. Divergent
2. Convergent
3. Transform-Fault
_______ is the innermost layer of the Earth
Core
What feature is created along the plate boundary when a plate subducts underneath another plate
Trench
This is the thickest layer of the Earth
Mantle
The San Andreas Fault in California is an example of a ____________________ boundary.
Transform-fault
Which place in the Philippines is considered as the safest due to its very low risk in geologic disasters?
Palawan
The mantle is mostly consisted of ____________.
molten rocks/magma
The theory that all continents are fragments of Pangaea now drifting apart
Continental Drift Theory
Plates float on top of the _______________________.
Asthenosphere
What do you call a break in the rock of the crust where rock surfaces slip past each other; usually occurs along plate boundaries
Fault
This theory states that the entire crust is broken and is continuously moving
Plate Tectonics
_________________ are a result from the build-up of stress at a plate boundary.
Earthquakes
The process that continuously adds new crust
Seafloor spreading
The rigid part of the Earth including the crust and the upper mantle (makes up the plates of the Earth)
What is the lithosphere
Pangaea ___ millions of years ago
250
This is the mechanism in the mantle that causes the plates to move
Convection current
This was a supercontinent that existed around 250 million years ago
Pangaea
Who is the proponent for the Continental Drift Theory?
Alfred Wegener
The Earth's crust is thinnest under the 1._____________________ and thickest under the 2._____________________.
1. Ocean
2. Continents
When oceanic crust meets oceanic crust along a convergent boundary, which plate is most likely to subduct?
The plate with the younger crust/less dense
What geologic feature is found in a divergent boundary at two oceanic plates?
Mid-ocean ridges
Which layer of the Earth’s interior is the driving forces of tectonic plates related to convection current?
Mantle