UNIT 4: Earth Science Chapter 21: Earth s Changing Surface (pages )
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1 CORNELL NOTES Directions: You must create a minimum of 5 questions in this column per page (average). Use these to study your notes and prepare for tests and quizzes. Notes will be turned in to your teacher at the end of the Unit for scoring. UNIT 4: Earth Science Chapter 21: Earth s Changing Surface (pages ) I. Weathering and Soil A. - process of physical or chemical breakdown of a material at or near Earth s surface. 1. Involves the interaction of air, water, and rock over 2. Everyday weathering- is going on all around you everyday B. Mechanical Weathering- turning big pieces into little pieces 1. Prying rock apart a. can enter fractures in rock. When freezes and expands will crack apart b. Growing roots example of biological force c. Rocks can act as agents. Falling rocks can hit and split other rocks 2. Smaller rocks have greater surface area to volume which increases likelihood that material will be attacked by agents C. Chemical Weathering 1. Forms new compounds and release elements into the a. Elements released enrich soil and nourish b. Without weathering of rocks there would be no 2. Matter on the Move- Cycles of chemical weathering affect all environments from to 3. Rock Rust- is a common weathering process a. Iron combines with oxygen to form iron oxide ( )
2 b. Other minerals also form oxide minerals (i.e. oxidizes to greenish-colored patina) 4. Feldspar Weathering- important process for rocks 5. Differential Weathering- different rock formations tend to weather at different D. Soil- mixture of weathered rock, organic matter, water, and air that is capable of supporting plant 1. Soil - layers with unique texture and color a. Soil shows specific layers for given area b. Composition of parent bedrock, climate, kind of organisms on surface, shape of land, slope angles determine specific.
3 2. Soil Types- many different types a. used as basis to characterize many types of soil b. Separated by composition and properties c. Precipitation and temperature range affect that forms d. important for providing supply of organic matter e. In arctic and deserts where there is no vegetation, there is no 3. Parent material- II. Shaping the Landscape a. Some form in same place as parent bedrock b. Some soils forms from transported materials from distant sources ( and glaciers) A. Erosion, Transport, ad Deposition 1. Mountains and other landforms subject to continuous a. a factor b. Action of,, or removal of surface material through process of weathering 3. transport- movement of eroded material from one place to another by water, wind, and/or glaciers 4. - When transporting agent drops it load of eroded material B. Running Water 1. Drainage basins- all the land that gathers for a major river
4 C. Glaciers a. Like branching tree (include ) b. Drainage basins in area for major rivers 2. Channel Development- a path for water created by. a. Rivers can create -shaped valleys b. Steep canyons can form when downcutting is 3. Stream - accumulations or bars of sediment in stream channels a. Sediment is dropped when running water b. Usually forms on inside bend of rivers where speeds are 4. Floodplains- sediment left after floodwaters subside along the valley a. Floodplain part of river, but only submerged during b. Can rejuvenate quality 1. Formed when winter snowfall exceeds summer melt a. Must take place year after year for hundreds to thousands of b. Compaction within thick mass of snow creates ice c. Begins to spread out under its own d. Become effective agents of e. As ice moves, act like giant - scraping, gouging, and plucking soil and surface rocks
5 D. Wind 2. Erosional features a. Valley and continental glaciers leave behind deep grooves or striations b. Glaciers convert -shaped valleys into -shaped valleys c. Cutting force is dependent on d. Bowl shaped depression (cirque) is formed where first accumulates 3. Glacier deposits a. When glaciers, they dump material they were carrying b. Material called - composed of random sediments ranging in size from tiny clay particles to house-sized boulders c. - large ridges of till that accumulates at edge of glacier 1). End moraine forms at of glacier 2). Lateral moraine- forms at of glacier 3). moraines- formed when glaciers join together 4). Ground moraine- forms melting continental ice sheets d. Deposits of outwash material are layered and sorted by by action of water e. Deposits in flat areas often become fertile 1. Wind ability to pick up and carry large particles a. Can act like -blaster
6 b. Can and smooth landforms 2. Erosion by wind a. - the removal of small particles by wind b. pavement- rocky, rough texture caused by deflation 3. Wind deposits- sediment dropped as decreases E. Wave Action a. Shapes and sizes of landforms depend on how constant the wind velocity is and supply of b. form as wind moves sand-sized particles 1. Extreme operate where land meets open water 2. Currents from wave action a. churn up beach sediment b. Sediment carried back toward c. Then moved toward shore at angletransporting sediment ( current)
7 3. Erosion from wave action a. Action of waves with sediment works like and causes abrasion b. Results in pebbles and cobbles on beach 4. Deposition by wave action F. Mass Wasting a. Sediments can be deposited as offshore sand ridges or b. bar- sandbar that seals off a bay c. - sand bars that project into water from land and curve back toward land in a hook shape d. islands- sand deposits formed offshore 1. When erosion occurs as a result of a. Occurs where slopes are overly steep or lacking b. Usually begins when support at base of slope is 2. Erosion by mass wasting a. Dependent upon type of event and type of involved b. Landslides or rockslides can produce distinct on slopes c. Mudflows occur after heavy or snowmelt 3. Deposition by mass wasting a. Materials in disorganized masses b. Material replaces undermined material at
8 c. Slope becomes stabilized when material builds up and mass wasting III Groundwater A. The Water Cycle 1. Oceans contain % of Earth s water a. 2.8% is (3/4 s tied up in glacial ice) b. Less than % of Earth s water available 2. Water cycle B. Groundwater a. The cycling of freshwater b. Enters cycle through of seawater c. Lesser amount enters through (from plant leaves as water vapor) d. provides energy for evaporation and transpiration e. Water vapor forms clouds which provide f. Most precipitation goes back to g. Water falling on land can evaporate, runoff as stream flow, or infiltrate Earth H. - process by which water enter Earth to become groundwater below surface 1. Water stored underground a. Moves through spaces of sediment and rock b. zone- region near surface where water infiltrates freely c. zone- area below where water completely fills pore space
9 d. Water - boundary separating two zones 2. Groundwater storage a. Absorption of water depends on material, saturation level, and b. - A rock unit that can transmit water through its pore space 1). Sandstone and limestone make aquifers 2). Shale or clay or infiltration 3. Porosity and Permeability C. Water Resources a. Combined volume of pore spaces defines materials b. - measure of how well a fluid can pass through a material 1. Obtaining groundwater a. - where water table intersects the ground surface b. - holes dug or drilled into Earth to reach water table c. Natural of groundwater has both horizontal and vertical components 2. Water under pressure a. wells- wells drilled into aquifers that are under natural pressure to force water up into well b. These wells are usually free flowing at the 3. Pollution and groundwater resources a. can enter groundwater through infiltration
10 b. Particles can larger contaminants c. Some can groundwater (i.e. arsenic) IV. Geologic Time A. Time 1. Absolute and Relative Dating a. dating- process of assigning a precise numerical age to an organism, object, or event b. dating- process of placing objects or events in their proper sequence of time 2. Uniformitarianism- states that the laws of nature operate s they have in the a. By studying how geologic events take place today, can infer how events took place in the past b. The is the key to the B. Principles of Relative Dating C. Fossils 1. Principle of superposition- the oldest rocks in an undisturbed sequence of rock layers will be at the 2. Original Horizontality- sedimentary layers start off a. If layers not horizontal they have been b. Must have been moved by some 3. Overlapping Features- Any rock formation or fault is than the rock or feature that it cuts through 4. Unconformities- represent in the rock record during which erosion occurred or deposition was absent 1. - remains or traces of organisms found in the geologic rock record
11 2. - The process of matching distinctive rock units from different regions a. Used by paleontologists in correlating fossil-bearing rock units on a scale b. fossils- organisms what were widespread geographically, but lived in narrow, well-defined period of time 3. Geologic Time Scale- boundaries of time that existence of certain life forms and catastrophic geologic events D. Absolute Dating 1. Use the radioactive atoms in minerals like a to measure passing of time 2. Radioactive decay- some types of atoms are and decay to produce new isotopes 3. Half-life- the time it takes for 1/2 of a radioactive sample to
12 4. Useful Isotopes a. Carbon-14 useful in dating organisms b. Other isotopes used to date ages of rock (use unaltered minerals in rocks) 1). Use isotopes with very halflives 2). Do not use sedimentary or metamorphic rock because action of or other fluids affect composition E. Geologic Maps- show horizontal distribution of various rock formations 1. and - compressional forces due to plate tectonics cause layer to fold and dip downward 2. - folding and wrinkling of crust caused by compression 3. Plunging Folds- forces produce tilted folds
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