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Transcript of Geology Chapter 15. Geology The science devoted to the study of dynamic processes occurring on the...
![Page 1: Geology Chapter 15. Geology The science devoted to the study of dynamic processes occurring on the Earth’s surface and in its interior.](https://reader035.fdocuments.in/reader035/viewer/2022062422/56649ef05503460f94c00e60/html5/thumbnails/1.jpg)
Geology
Chapter 15
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Geology
The science devoted to the study of dynamic processes occurring on the Earth’s surface and
in its interior
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Essential Question #1
What are the characteristics of the
three major concentric zones of earth?
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Three Concentric Zones• Core – innermost zone– Extremely hot– Solid inner part surrounded by liquid molten material
• Mantle – middle zone– Outermost part is solid rock– Asthenosphere = inner part made of hot partly melted
pliable rock that flows
• Crust – outermost zone– Continental crust– Oceanic crust
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Earth’s Crust and Upper Mantle
Lithosphere = Crust and outermost Mantle
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Fig. 15-3, p. 337
Spreading center
Ocean trench
Plate movement
Subduction zone
Oceanic crust
Continental crust Continental
crustMaterial
cools as it reaches the outer mantle
Cold dense
material falls back through mantle
Hot material
rising through
the mantle
Mantle convection
cell
Two plates move towards each other. One is subducted back into the mantle on a falling convection current.
Mantle
Hot outer core
Inner core
Plate movement
Collision between two continents
Tect
onic
pl
ate
Oceanic tectonic
plate
Oceanic tectonic plate
Oceanic crust
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Essential Question #2
How does the movement of tectonic plates shape the earth’s
surface and other zones?
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Tectonic PlatesConvection cells (currents) in the mantle move
large volumes of heat and rocks in loops, causing the movement of large rigid plates (lithosphere)
on the earth’s surface.
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Tectonic Plate Boundaries
• Convergent – push two plates together
• Divergent – spread plates apart (oceanic)
• Transform – plates slide past each other
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Tectonic Plate Boundaries• Convergent Plate Boundaries– Subduction - Continental plate usually pushes oceanic
plate down into mantle– Forms a trench in ocean & mountains on land
• Divergent Plate Boundaries– As oceanic plates spread apart, molten rock (magma)
pushes up the cracks forming ocean ridges
• Transform Faults– Plates slide and grind past one another along a
fracture (fault) in the lithosphere– Mostly in oceans– San Andreas Fault , CA
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Major Tectonic Plates & Boundaries
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Volcanos
Often form along the boundaries of tectonic plates where magma can escape in the form of lava
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Ring of FireHuge ring of volcanic and seismic activity
Includes 452 volcanos; over 75% of world’s active and dormant volcanos
About 90% of the world’s earthquakes & 81% of the world’s largest earthquakes occur here
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Earthquakes• Colliding plates create tremendous pressures in the crust
• Earthquakes occur when stresses cause rocks to suddenly shift and break, forming faults
• Abrupt movement of faults release stored energy in the form of seismic waves, which move in all directions through the surrounding rock
– Focus = place where an earthquake begins
– Epicenter = place on the surface directly above the focus
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Earthquake in Haiti – January 2010
• 7.0 Magnitude, followed by at least 52 aftershocks 4.5 or greater
• Over 220,000 dead; damaged 250,000 residences & 30,000 commercial buildings
• Despite humanitarian aid efforts, over 370,000 people still without homes today
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Ocean Earthquakes & Tsunami’s
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Indian Ocean Tsunami - 2004• 9.15 Magnitude earthquake on ocean floor generated
waves as high as 100ft
• Killed ~228,000 people in Indonesia, Thailand, Sri Lanka, South India & Eastern Africa
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Japan Tsunami - 2011• 9.03 magnitude earthquake on ocean floor generated
waves as high as 133ft
• Over ~16,000 reported dead/missing
• Estimated economic cost $235 billion (US) – costliest natural disaster in world history
• https://www.youtube.com/watch?v=av1Ieq0q06Q
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Essential Question #3
How do physical, chemical and biological weathering
generate soil?
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Weathering
The physical, chemical, and biological processes that break down rocks and minerals
into smaller particles that help build soil.
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Weathering Physical (Mechanical) Weathering• Large rock broken down into smaller pieces
Chemical Weathering• One or more chemical reactions slowly
dissolve the minerals in rocks
Biological Weathering• Conversion of rocks or minerals into smaller
particles through the actions of living things
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Fig. 15-6, p. 340
Parent material (rock)
Biological weathering
(tree roots and lichens)
Chemical weathering
(water, acids, and gases)
Physical weathering
(wind, rain, thermal expansion and contraction, water freezing)
Particles of parent material
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Erosion
The process by which material is dissolved, loosened, or worn away from one part of the
earth’s surface and deposited elsewhere
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Mass Wasting
When rock and soil become detached from underlying material and move downhill under
the influence of gravity
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Essential Question #4
What are the three classes of rocks, and how are
they recycled by the rock cycle?
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Rock• A solid combination of one or more minerals
that is part of the earth’s crust
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3 Types of Rock• Igneous– Forms when molten rock (magma) wells up from the
earth’s upper mantle, cools, and hardens
• Sedimentary– Forms from sediment produced when existing rocks are
weathered and eroded into small pieces– Compaction (pressure) + Cementation (minerals seeping
through sediment deposits) bind particles forming rock
• Metamorphic– Forms when a preexisting rock is subjected to high
temperatures / pressures, chemically active fluids, or a combination
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Fig. 15-8, p. 343
Erosion
Transportation
Weathering
Deposition
Igneous Rock
Granite, pumice, basalt,
lava rock
Sedimentary Rock
Sandstone, limestone, shale,
dolomite, bituminous coal
Heat, pressure
Cooling
Heat, pressure, stress
Magma (molten rock)
Melting
Metamorphic RockSlate, marble, gneiss,
quartzite
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Soil: A Renewable Resource
Chapter 3
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Essential Question #5
What is soil and why is it important?
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Soil
A thin covering over most land that is a complex mixture of eroded rock, mineral nutrients,
decaying organic matter, and billions of living organisms (most of them microscopic
decomposers)
Soil is a renewable resource that is renewed very slowly
(100’s to 1000’s of years)
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Ecological Services of Soil• Supply nutrients to producers
• Cleanses & stores water
• Important in biogeochemical cycling– Decomposes organic matter
• Helps control climate by sequestering carbon
• Habitat for soil organisms
• Scientific research - antibiotics
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Economic Services of Soil
• Supports agriculture industry– Food, feed, fiber, fuel, etc
• Provides food security
• Stores solid waste
• Foundation for cities and towns
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Soil & Human Civilization
• Human activities have accelerated natural soil erosion since the beginning of agriculture
– Mismanagement turns soil into a nonrenewable resource
• Sophisticated civilizations such as the Mayans, Easter Island, Harappan (India) ended as a direct result of mismanaging soil
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Essential Question #6
What are the three sizes of particles that compose soils, and how do they
determine soil texture?
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Soil Particle Size
• Sand– Largest
• Silt– Medium
• Clay– Smallest
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Physical Properties of Soils• Soil Texture
– Relative proportions of sand, silt & clay particles in a soil
– Measured using Soil Triangle– LOAM Soil = BEST for plant growth
• Permeability– The rate at which water moves through
soil– Porosity – the amount, size and
arrangement of pores between particles
• Water Holding Capacity– Ability of pores to hold water for plant use
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Soil Texture Triangle
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Chemical Properties of Soil• Nutrients– Primary: Nitrogen (N), Phosphorus (P), Potassium (K)– Secondary: Sulfur (S), Calcium (Ca), Magnesium (Mg)
• pH– Affects availability of plant nutrients– Optimal pH between 5.5 – 7.5– More acidic soils hold more toxic nutrients– Affects soil organisms & nutrient cycling
• Salinity– Salts come from irrigation water, fertilizers, composts &
manure
Soil Salinity and Interpretation
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Organic Matter & Soil
Microorganisms are the driving force for nutrient release to plants
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