Rocks and Minerals
Rocks are made of
minerals
The movement of lithospheric plates is caused by
convection currents or heat
Due to plate movement at plate boundaries, this often occurs
earthquakes
Contact metamorphism is where rock has been changed due to...
heat
Carbon 14 is used for objects that are less than this many years
75,000
This type of igneous rock cooled slowly and has large crystals
Intrusive
Transform plate boundaries slide past each other. An example of this where in the US
west coast or California
Wind, water and ice constantly reshape Earth in this process
erosion and deposition
What do we know about the age of intrusions compared to the rock around it
younger
What is the daughter product of Uranium 238
Lead 206
Mineral alignment in metamorphic rocks is called
foliation
What feature is created at convergent subduction zones
trenches
These are formed from underwater volcanoes and are often in aligned clusters
island chains
The law of superposition states that rocks lower in Earth are
older
If there is 25% carbon 14 in an a bone how old is the bone?
11,460 years
Name two processes that form sedimentary rocks
burial, compaction, cementation
Describe the relative thickness and density of continental crust
Thicker and less dense
This is an area on the asthenosphere where hot magma continually seeps out in the same spot even as the plate move over it
hot spot
A good index fossil must be
short lived, widespread, abundant
What percent of U238 would be left after 9 billion years
25%
This type of rock is fomed at divergent plate boundaries and results in underwater mountain ridges
igneous
magnetic polarity "stripes" on the ocean floor is evidence of this type of plate movement
What orogeny was created around 458 million years ago
Taconian
This is the name of the process that changes the position of rock that was once laid down horizontally (law of horizontality)
uplift
Name two datable materials used when using potassium 40 to calcualte the age
mica, feldspar and hornblende