What are the three types of unconformities? How does each form?
What will be an ideal response?
Angular unconformity occurs between inclined layered rocks and horizontal rocks.
The missing time includes the period between tilting and eroding the rocks, and deposition of the more horizontal overlying unit.
Disconformities occur in rocks which are all at the same angle (horizontal or inclined), but are represented by a surface of erosion. The time missing includes the period when the sediments were eroded until the overlying unit was deposited.
A nonconformity occurs when sedimentary or volcanic rock overlies crystalline (igneous or metamorphic). The time missing includes the period after the metamorphic rock was formed and ultimately exposed at the Earth's surface until the overlying sediments or lava was deposited.
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What are blowouts? What term describes the process that creates these features?
What will be an ideal response?
Hurricanes tend to intensify when they move over land surfaces
a. True b. False Indicate whether the statement is true or false
Nitrates and phosphates are examples of
A. infectious agents. B. oxygen-demanding wastes. C. heavy metals. D. plant nutrients. E. sediment.
A silica tetrahedron is composed of four atoms of the element ________ and one atom of ________.
A. silicon; aluminum B. silicon; iron C. oxygen; silicon D. aluminum; silicon E. silicon; oxygen