Water-saturated muds have low permeabilities but can have greater porosities than well-cemented sandstone.
a. true
b. false
Ans: a. true
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In the core's current food regime, ________ are dominant
A) wheat and livestock B) fresh fruits and vegetables C) fast foods D) free-range chicken and hormone-free beef
International organizations and non-governmental organizations argue that the key to food security and reduced risk from famines and chronic hunger can be attained only through attention to
A) food sovereignty. B) free trade. C) increased production. D) GMOs and improved technologies. E) alternative food movements.
mP air masses
A) are colder than cP masses. B) are drier than cP masses. C) can produce northeasters on the Atlantic Coast of North America. D) rarely affect North America.
We know from the Apollo missions and unmanned probes that the moon's surface is covered with loose, unconsolidated material with a texture similar to soil on earth. How did this material form on the moon?
A) The material is mostly volcanic ash ejected from volcanos that are no longer active. B) The loose material is mostly micrometeorite fragments and ejecta from impact craters, so is very different from soil on Earth. C) The material is produced by spalling from rock surfaces caused by the extreme heat-cold cycles as the moon rotates through a 1 lunar day, or approximately one Earth month. D) The same as Earth, but soils are ancient from a time when the moon still had an atmosphere and water.