How does geomagnetism provide support for seafloor spreading?
A) Magnetic particles in basalt orient with the magnetic field in force at the time the oceanic lava cooled and hardened; the magnetic pattern is the same on both sides of the ridge.
B) Mantle hot spots are always oriented to the magnetic field.
C) The ocean floor is uniformly old, preserving the Earth's 4.6 billion history including past reversals in polarity.
D) The oldest oceanic crust is always found near mid-ocean ridges. As one moves out from these ridges, the crust is simultaneously younger and oriented according to the polarity at the time.
E) Isotopic analysis of ocean core sediments help determine sea floor age and this can be used to infer past magnetism.
A
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Which of the following defines Earth's radiative equilibrium temperature?
A. the average temperature Earth must maintain to prevent the oceans from freezing solid B. the temperature at which solar radiation and infrared radiation are absorbed at equal rates C. the temperature at which the Earth radiates energy at maximum intensity D. the temperature at which rates of evaporation and condensation on the Earth are in balance
The mineral ________ is strongly magnetic.
A. magnesite B. pyrite C. calcite D. quartz E. magnetite
Match the word with the correct definition
A) Rock or regolith that can store and transmit water but is contained between two impermeable layers B) Rock or regolith that can store and transmit water and receives its recharge directly from the atmosphere C) Impermeable layer that prevents flow 1) Aquitard 2) Confined aquifer 3) Unconfined aquifer
Judge the following sentence according to the criteria given below: Schooling prevents fish from swimming greater distances than individuals BECAUSE each schooling fish gets a boost from the vortex created by the fish swimming in front of it
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.