Continental Drift
Who developed the theory of Continental Drift?
Alfred Wegner
A student wants to set up an investigation to determine the identity of several different minerals. What would be the most useful when identifying a mineral?
hardness
What boundary creates crust?
Convergent Boundary
Which layer of the Earth makes up 70% of the Earth’s mass?
Mantle
What are the three major types of rocks?
Igneous, sedimentary, and metamorphic
Where do most geologic events, such as volcanoes and earthquakes, take place?
On plate boundaries
Which property describes how a mineral reflects light from its surface
Luster
What boundary destroys the crust?
Divergent Boundary
Order the layers of the Earth from least dense to most dense.
crust, mantle, outer core, inner core
Sandstone is formed when sand becomes buried under new layers of material and, over thousands of years, cements together to form rock. Sandstone can be classified as which type of rock
The continents have changed positions over a very long period of time. This means that the plates are __
Moving slowly
What is a mineral's streak?
The color of its powder
This boundary doesn't destroy or create crust? and How are the plates moving?
Transform boundary
Sliding past each other
The continental crust floats on top of the mantle because the crust is
less dense than the mantle
How are igneous rocks formed?
by the cooling of molten material
What theory explains hen magma rises, cools, and spreads out & creates a new crust
Sea Floor Spreading
definition of a mineral?
A naturally occurring, inorganic solid with a definite chemical composition and crystal structure
When plates are sliding past each other, what geological event will occur?
Earthquakes
What current happens in the mantle? Explain the current.
Convection Currents. Rise and sinks
How are metamorphic rocks formed?
When existing rocks are changed by heat and pressure
Explain Continental Drift and Why no one believed it?
one of the earliest ways geologists thought continents moved over time
because Alfred couldn't prove how
Why are minerals important to rocks?
Rocks are made up of one or more minerals.
What happens when an oceanic plate and a continental plate collide?
The oceanic plate subducts under the continental plate
Why is the inner core solid if the outer core is liquid?
affected by the pressure from layers above it
What is erosion and weathering?
The movement of weathered material from one place to another
The breaking down of rocks at Earth's surface