If we increase the fluid pressure in a sandstone unit, will the effective stress increase or decrease?
What will be an ideal response?
Answer: If we look at Equation 5.2 it is obvious that increasing pf reduces the effective stress. This is because an elevated fluid pressure helps lifting the overburden so that the stress across grain contacts becomes smaller.
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The oldest oceanic crust is slightly less than ____ years old
a. 300,000 b. 4.6 billion c. 70,000 d. 180 million e. 3.96 billion
What is a microecosystem?
A) A community engaging in a microbial loop B) A community producing more than its consuming C) A community used for planktonic breeding D) A community operating on the smallest scale
Which of the following best matches the description?Process of breaking up large particles by physical forces.
A. soil profile B. horizon C. asthenosphere D. soil texture E. mechanical weathering F. parent material G. weathering H. loam I. leaching J. friable K. windbreak L. humus M. contour farming N. soil structure O. chemical weathering P. terrace Q. lithosphere
The type of fault shown in this figure is a
A. reverse fault. B. strike-slip fault. C. normal fault. D. dip-slip fault.