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22 Cards in this Set
- Front
- Back
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Mass wasting is also known as?
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slope failure
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How to classify mass wasting
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1. speed
2. amount of water (saturation) |
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fastest lasndslide?
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mudflows, debris flow (aka landslide), debris fall, rock fall
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slowest landslide?
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soil creep
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Moderate spee landslides?
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debris slides, rock slides, slumps
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What are ladslides?
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rock and debris slides. The slope fails along a plat of weakness.
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Describe a rock slide
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not much debris, large blocks of rock, most likely to occur on steep slopes with a lot of loose material overlaying the soil or bedrock.
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Which silicate mineral group is most resistant to weathering?
Lest resistant? |
quartz = most resistant
olivine = least resistant |
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How are cross beds formed?
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Clasts fall down small ripples
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What is evaporate?
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The evaporation of water
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How do sediments become rock?
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To become a rock, sediments are lithified
by dewatering, compac6on, and cementa6on |
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The use of fossils represents the use of _______ dating
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Correlative dating
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What are index fossils?
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fossils that identify and date strata in which they are found
characteristics: distinctive, common occurrence, existed over a specific time period, widespread |
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How do you get Carbon 14 (C14) into your body?
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eating food
and breathing |
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What is the half-life of Carbon 14?
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5730 / 5740 years. 5730 more accepted
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When did dinosaurs go extinct?
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65 million years ago
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How old is the earth?
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4.55 billion years old
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What is uniformitarianism?
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The present is the key to the past
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In what 2 processes are chemical/biogenic sedimentary rocks formed?
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1. Evaporation of water (evaporite)
2. fragments of animal shells (bioclastic) |
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What are the 5 mass wasting triggers?
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• Earthquakes, other vibrations– Rock falls, shallow slumps
• Oversteepened slope– Erosion at toe by river; volcanoes • Vegetation Loss– Shallow slumps • Ice wedging– Rock falls • Intense Rainfall – All types |
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oversteepening is caused by what 2 factors?
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1. rapid deposition - new land quickly building up on a steep side of a slope
2. rapid erosion - wave action quickly eroding |
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Landslides are triggered by?
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1. Intense rainfall
2. Earthquakes 3. Oversteepened slopes |
