Geography Unit 3

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marble

Which rock results from the metamorphosis of limestone?

Mt. St. Helens

What Volcano is an example of a stratovolcano?

Lahar

what is not a landform created by glacial activity

Biomes

Areas of similar vegetation, climate, soil, topography

Low Latitude rainforest

Equatorial Region: Wet Equatorial Climate. Consistent rainfall, high temperatures. Broadleaf Evergreen Trees. High productivity and High species diversity

Sub-Tropical Evergreen Forest

Southeastern US and Southern Asia. Broadleaf and/or needleleaf. Relatively few species of trees. Two Layers.

Monsoon Forest (Tropical deciduous forest)

Boarders tropical rainforest, transitional to less wet climates. Mix of evergreen and deciduous trees. Less diversity, lower biomass, 2 layers of vegetation, dense understory compared to Tropical Rainforest.

Midlatitude Deciduous Forest

Extensive on N. Hemisphere continents. Tall broadleaf trees, dense canopy.

Needleleaf Forest

Pacific Northwest and Boreal Forest (aka Taiga)-NA and Eurasia. Severe mid latitude climates. Evergreen Needle leaf and evergreen deciduous.

Schlerophyll Forest

Small areas in mid-latitudes. Dry Summer, Wet Winter. Sclerophyll-thick, leathery leaves. Chaparral-Dense, fire adapted shrubs.

Savanna

Tall grasses. Big game. Serengeti plains. Wet, dry, and wildfire season.

Grassland

Steppe (Asia), Pampa (Argentina), veldt (South Africa), prairie (N. America). Perrenials. Migratory ungulates.

Desert

Drought resistant plants vs drought evading plants. Nocturnal, Burrowing mammals.

Tundra

Cold desert of grassland. Moisture scarce. Dwarf grasses. Migratory birds, animals.

geomorphology

the study of landform (characteristics, origins, development). It focuses on the surface of earth.

Landform

Individual topographic feature on the surface of the earth that can range in size. (Mountains, peninsula, sand dune)

Earth's Crust

<1% of Earth's Volume. 0.4% Weight. 8-40 miles thick. 47% Oxygen, 28% Silicon, 25% metals and bases.

Igneous Rock

Molten Rock source. Cools slowly=big crystals. Cools fast=small crystals. Intrusive and Extrusive. (transform from melting. Magma melts and forms rock when it cools)

Sedimentary Rock

Deposited on surface. Layering=strata. (transform from weathering and erosion. Compacted and cemented)

Metamorphic Rock

Altered igneous or sedimentary rock. Form deep in the earth. (transform from Heat and Pressure.)

Extrusive Rocks (igneous rock)

Spewed out. Cooled on earth's surface. Rapid cooling. Crystals too small to see with naked eye.

Intrusive Rocks (igneous rock)

Cooled below Earth's surface. Slow rate of cooling. Large crystals, seen with naked eye.

Mechanical Formation "Clastic" (sedimentary rock)

Weathering. Clastic-Formed from Fragments of other rocks.

Chemical Formation (sedimentary rock)

Precipitation of soluble materials (saltwater). Shell Accumulation.

Organic Formation (sedimentary rock)

Tissues of plants and animals. Solids-Peat and Coal. Liquids-petroleum. Gasses-natural gas.

Diastrophism (internal)

Deformation of the Earth's crust. Solid not molten material. Folding and Faulting.

Volcanism (internal)

Volcanoes

Weathering (external)

Processes that cause rock to disintegrate

Mass Wasting (external)

Gravity induced downhill movement of soil, rocks, and regolith (fractured rock). Soil Creep, earth flow, debris flows

Erosion/deposition (external)

Wearing away of soil

Faults

Extreme folds. Broken rock. Displacement. Horizontal and/or vertical movement.

Age of Crust

Ocean <60 million years. Continent >1 billion years. Age increases with distance from oceanic ridges. Oldest ocean crust is near the trenches.

Lahar

Volcanic mudflow. Ash and Pyroclastic materials. Mobilized by rain or melting snow. Rapidly moving.

Lateral Blast of a Volcano

Uncorking of pressure. Rock, ash, hot gases. Magmatic material-cryptodome exposed. 670 mph!

Pyroclastic Flows

Hot, incandescent mixtures of volcanic fragments and gases. Sweep along close to the ground. 450 mph! Lethal and destructive (pompeii).

Ash (tephra) Deposition

540 Million tons. 22,000 square miles. Football field piled 150 miles high

stratovolcano

Mt St Helens. Tall, steep sided cones. Felsic (rhyolite and andesite) lava, viscous.

shield volcano

Hawaiin Islands. Occur at mid-ocean ridges. Highly fluid. Slow eruptions are slow, broad expanse of lava flow. Forms low "shield." Little pyroclastic material.

Nuees Ardentes

french for glowing clouds

Landforms created by frost action

Talus Cones and "Felsenmeer"-Boulder fields

Landforms created by Frozen Ground

Patterned ground, pingo

Niche Formation

Salt Crystal Growth. Dry climates. Groud water moves through rock via capillary action. Salts deposited. Crystals grow.

Physical Weathering

Produces Regolith (fractured rock), frost/ice action (Talus cones and Felsenmeer-boulder fields), Salt Crystal Growth, Unloading, wind, wedging by roots

Unloading

In pressure release, overlying materials (not necessarily rocks) are removed which causes underlying rocks to expand and fracture parallel to the surface

Chemical Weathering

Hydrolysis and Oxidation. Acid Action. Changes strong rocks into weak ones, rich in clay minerals and oxides, warm, humid climates.

Acid action

Carbonic acid (CO2 +H20) Esp carbonate rocks

Soil Creep (Mass Wasting)

Slow movement of soil and regolith.

Earthflow (Mass Wasting)

Humid climates, water saturated soil, faster movement: hours. Too much water on the golf course!

Mudflow/Debris Flow (Mass Wasting)

Liquid mud flow caused by rapid precipitation or snow melt. Follows stream courses and moves rapidly. Ex: Alluvial fans

Natural Hazard

Unexpected or uncontrollable natural event of unusual magnitude that threatens the activities of people or people themselves

Natural Disaster

natural hazard that ACTUALLY resulted in widespread destruction of property or caused by injury and/or death

Tsunami

Japanese for harbor wave. Waves with very long wavelengths

Causes of Tsunamis

Sudden rise or fall of earth's crust under or near ocean. Displaces water column. Creates rise or fall in level of ocean above. Size and energy dissipates with time and distance from source. Volcanic activity and mudslides can also cause tsunamis.

Physical factors that affect tsunami severity

speed affected by water depth (500 mph in 20,000 ft water). Shallow water, speed slows but energy remains same. Energy dissipates slowly from source. When it reaches shore its modified by reefs, beaches, and land.

Human factors that affect tsunami severity

TWS. Tsunami Warning System. 26 member countries in the pacific. Seismic and tidal monitoring.

Glaciers

Large, natural accumulations of ice that FLOW/SLIDE downhill or from center of accumulation. They leave distinct geomorphic features.

Alluvium

loose, unconsolidated (not cemented together into a solid rock) soil or sediments, which has been eroded, reshaped by water in some form, and redeposited in a non-marine setting

Colluvium

loose bodies of sediment that have been deposited or built up at the bottom of a low-grade slope or against a barrier on that slope, transported by gravity.

Pleistocene Glaciations

Pleistocene (last 1.5 million years). Alternating glacial and interglacial times (100,000 year cycle).

Holocene Glaciations

Last ~10,000 years. Relatively ice free and constant conditions.

Laurentide Ice sheet

Canada sliding downward through the united states

Continental ice sheets

non-mountainous areas, blankets of ice

Mountain Glaciers

smaller, high elevation glaciers

Accumulation

addition of ice by new snow

equilibrium

additions and losses equal

alblation

loss of ice through melting, evaporation, and sublimation

Moraine

any glacially formed accumulation of unconsolidated glacial debris (soil and rock) which can occur in currently glaciated and formerly glaciated regions, such as those areas acted upon by a past glacial maximum.

subduction

one tectonic plate moves under another sinking into the earth's mantle

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