Geology Lab Final
The asthenosphere is
A layer of low rigidity that separates the rigid lithosphere from the rigid mantle
Which of the following is a possible origin of a metamorphic rock
A sedimentary rock is buried deep beneath other sedimentary rocks
The principle of inclusions states that
A sedimentary rock must be younger than the clasts that it contains
The lithosphere is
Composed of the entire crust and the uppermost mantle
If a sequence of sedimentary rocks has been folded and is now vertical
Graded bedding can help determine whether some beds are older or younger than the beds next to them
Well rounded grains in a clastic sedimentary rock indicate
Numerous collisions between particles during extensive transportation
Angular grains in a clastic sedimentary rock indicate
Rapid typically short distance transport
What changes take place during physical weathering
Rocks are broken into smaller pieces
The difference between sills and dikes is that
Sills are parallel to layering in surrounding rocks while dikes cut across layering
An igneous rock froms by
Solidification of magma at the surface or within the earth
An angular unconformity is evidence that
There is an incomplete geologic record preserved in an area
A porphyritic texture indicates that an igneous rock had
Two different cooling rates
The term relative age refers to
Whether a feature is older or younger than another
Sedimentary rocks that are formed in horizontal layers are called
beds
Sedimentary rocks are unique in that they form
by processes that operate at or near the earths surface
A phaneritic texture can be best described as having
coarse texture
Solidified lava flows and volcanic ash deposits are examples of
extrusive igneous rocks
The principle of superposition can be used to determine the relative ages of all of these except
folded sedimentary rocks
The grain size of an igneous rock is determined by the
rate of cooling which controls the amount of time ions have to migrate to crystal seeds
Why is quartz one of the most abundant minerals
resistant to weathering and most common element