Earth's Layers
Who came up with the Theory of Continental Drift?
Alfred Wegener
Where is the heat source that starts a convection current?
Core
Name the 3 types of plate boundaries.
Transform, divergent, convergent
What is the horseshoe shaped region in the Pacific Ocean where the majority of the Earth's earthquakes and volcanoes occur?
The Ring of Fire
What was the large supercontinent of the past called?
Pangea
As the magma is heated it _____ toward the crust and becomes _____ dense as it cools.
rises; more
A mid-ocean ridge is an example of what kind of plate boundary?
Divergent
Earth's crust is divided into 15 _____ _____.
Tectonic Plates
Iron and Nickel
What 4 kinds of evidence were used as evidence in the Theory of Continental Drift?
Fossil, glacier evidence, continent shape, rock strata
The Earth's _____ contains the top layer of the mantle and the crust that moves as a result of convection currents.
Lithosphere
What are the two types of crust AND which is more dense?
Oceanic and Continental Crust
Oceanic Crust is denser
When is your summative assessment?
MONDAY
Why is the inner core solid?
The temperature and pressure is so high in that layer.
True or False: Alfred Wegener knew about convection currents.
False
What kind of landform is produced when 2 continental crust plates diverge?
Rift Valley
According to the Law of Superposition, where will the oldest fossil be found?
The bottom layer
Convection currents happen in this layer? (Hint: not the mantle.)
Asthenosphere
Describe how the theory of Continental Drift was received by the scientific community.
Laughed at, not accepted, ridiculed, etc.
Magma that is far from the heat source is cooler and _____ dense.
more
Why is a transform boundary also called a conservative boundary?
Because the crust is conserved - no crust is created or destroyed.
What does an index fossil tell geologists?
The relative age of the rock layers