please circle and describe the answer for the mutable choice A through M a.) The
ID: 287237 • Letter: P
Question
please circle and describe the answer for the mutable choice A through M
a.) The greatest ocean depths are:
- at the mid-ocean ridges
- at passive margins
- at the hot spots
- at subduction zones
b.) Plutonic rocks are emplaced at depth yet they can be seen at the Earth's surface due mainly to_____
- widespread igneous inversion
- erosion of overlying rocks due to uplift
- catastrophic violent upheavals that bring them to the surface
- continual ongoing intrusion after the magma solidifies
c.) In nature, where does the acidity come from to speed up chemical weathering?
- plutonism
- nuee ardentes from explosive volcanic eruptions
- Bowen's reaction series
- organic acids from decayed plants, acid rain, and sulphuric acid from oxidation of pyrite
d.) The __________ is the most recent glaciation episode during the Pleistocene in North America
- Wisconsin
- Kansan
- Manitoban
- Dakotan
e.) Silicate igneous rocks make up the_________
- majority of shallow rocks covering the continents but everything deeper is sedimentary and metamorphic
- bulk of the Earth's crust and mantle
- densest rocks and are mainly found in the core
- bulk of volcanic mountains but not much else on Earth
f.) Explosive volcanic eruptions occur______
when violently escaping gases evolve suddenly to drop the magma density and propel molten magma from the chamber
in response to deflation of the volcano
when crystallization forces exceed the strength of the volcano
whenever basaltic magma extrudes on the seafloor
g.) The principal causes of mechanical fragmentation of rocks in place are ______< >erosion and transport by moving wind, water, or ice
the relentless actions of Sisyphus
always inscrutable because they happened at some time in the past
biologic activity, expansion from unloading, frost wedging
h.) The three major processes involved in chemical weathering are ______< >dissolution, hydrolysis, and oxidation
precipitation, ion exchange reactions, and degasification
carbonation, dissimulation, and salinization
recrystallization, pitting, and rinsing
i.) The main direct geologic effect(s) of glaciers is (are) to
raise global sea level by depressing the crust
warm the global climate by absorbing more solar radiation
erode the continental landscape and to transport and deposit sediments
reduce high latitude marine sedimentation by reducing biologic productivity
j.) Compared to earlier or subsequent streams in the same valleys, alpine glaciers move ________ but carry _______ sediment.
faster; less
mainly in the winter; mostly very coarsea
little slower; only finer
very much slower; vastly more
k.) Which of the following best describes the term glacial drift?
slow, plastic flow in the brittle zone of a glacier
the sedimentary materials outwash and till
the slow, southward advance of the continental ice sheets over Canada and North America during the Pleistocene
floating of icebergs southward from the north polar seas
l.) All of the following descriptions apply to stratified drift (not till) except for______
commonly layered, well sorted sand and gravel beds
deposited in advance of the ice front on outwash plains, in glacial lakes, or fjords
deposited or redeposited by glacial meltwater
rock flour deposited directly from advancing ice
m.) Which one of the following prominent features were significantly larger than at present day during the Pleistocene glacial episodes?
horns, arétes, and cirques produced by alpine glaciation
the Great Lakes and Lake Agassiz
terminal moraines of continental ice sheets that moved south from Canada
subaerial fan deltas covering more extensive coastal plains
Explanation / Answer
a] At subduction zones is the correct option.
b] Widespread igneous inversion is the correct option.
c] Organic acids from decayed plants, acid rain, and sulphuric acid from oxidation of pyrite is the correct option.
d] Wisconsin is the correct option.
e] Bulk of the Earth's crust and mantle is the correct option.
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