The kind of weathering shown in the diagram is known as Frost action or Ice wedging
Why does the powdered limestone react with the acid at a greater rate than the larger rock? It has a greater surface area in contact with the acid
After several minutes of shaking mineral B has lost mass and become rounded while mineral A is unaffected. Explain why. Mineral A is harder (more resistant to abrasion) than mineral B
Which of the following minerals would be altered most by contact with acid? A) KAl 3 Si 3 O 10 (OH) 2 B) (Fe,Mg) 2 SiO 4 C) Fe 3 Al 2 Si 3 O 12 D) CaCO 3 C) CaCO 3 (carbonate minerals react with acid while silicate minerals do not)
Fe 3 Al 2 Si 3 O 12 because it is the hardest (most resistant) mineral. (see page 16 reference tables) The following minerals were placed in a container of water and shaken for 30 minutes. At the end of that time which mineral showed the least evidence of weathering and WHY? A) KAl 3 Si 3 O 10 (OH) 2 B) (Fe,Mg) 2 SiO 4 C) Fe 3 Al 2 Si 3 O 12 D) CaCO 3
At which location in the diagram is the stream velocity lowest? Velocity is lowest at location D (the inside of a curve)
A rock, found in the desert, has a pitted surface. Which agent of erosion is most likely responsible for the rocks appearance? The rock has been pitted by sand moved by the WIND
Explain why the rocks have eroded unevenly. Differences in hardness (resistance). The softer rocks have eroded more than the harder ones.
DAILY DOUBLE DAILY DOUBLE
At which location (A through D) is the water velocity greatest and explain why Velocity is greatest at B because it is farthest from the bottom and sides (less friction)
According to the data, at which location was the gradient of the stream greatest? At location C - the water velocity is greatest.
Which agent of erosion is responsible for the deposition of the cross section of sediment seen in the diagram? Running Water
Which agent of erosion is responsible for the deposition of the sediment seen in the diagram? Ice (glaciers)
At which location would the smallest particles probably be deposited? Location D
If the velocity of a stream decreased from 400 cm/sec to 50 cm/sec which particle(s) would remain in suspension? Sand, Silt, and Clay (must name all to get money)
What kind of particles would most likely be deposited in the lake beyond the location of the clay deposits? Colloids
In what kind of climate does chemical weathering proceed at the fastest rate? Warm (hot) and Wet
Some rocks such as limestone are weathered by contact with acid. This kind of chemical weathering is known as Carbonation
Name the 4 methods by which sediments are transported by running water. Floatation, Suspension, Rolling (saltation) and in Solution.
What is the force that drives all erosion? Gravity
Name 3 stream characteristics that can affect the rate of erosion. Slope (gradient), Rate of discharge, Shape of the stream channel.
Sharp and angular rock fragments are found at the base of a vertical cliff. By what method of erosion were they transported there? Gravity
Scratched and polished rock was probably eroded by Glaciers
What term describes the granite rocks depicted in the diagram? Erratics
Name 3 factors that can affect the settling rate of particles in still water. Size, Density, and Shape
Name any 5 characteristics of regions shaped by glacial erosion and deposition. 1) Parallel grooves in rocks 2) U-shaped valleys 3) Scratched and polished rock 4) Erratics 5) Deep parallel lakes 6) Usorted, unconsolidated sediment
FINAL JEOPARDY ? Forgetaboudit!
Raoul drops many balls into a column of water all at the same time. They settle to the bottom as shown in the diagram. Explain why this unexpected result occurred. The smallest balls are the most dense and the largest balls are the least dense.