Orbiting molecules of water in a wave touch the sea or lake floor at the depth of the
____________________. Fill in the blank(s) with the appropriate word(s).
wave base
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Porosity is the term that describes the amount of void space within a material. What explains why porosity is important with respect to soils?
A. provides plant roots access to moisture and oxygen B. provides space for the breakdown of aluminum minerals C. makes soils less compactable D. allows iron oxides to accumulate E. reduces the ability of erosion to strip away topsoil
Match the rock with the correct igneous composition. (Some choices will be used more than once.)
A) Felsic B) Intermediate C) Mafic 1) Rhyolite 2) Pumice 3) Gabbro 4) Diorite 5) Andesite 6) Obsidian
The definition of urban used by the World Bank is
A) 1,000 people. B) 2,000 people. C) 10,000 people. D) 50,000 people. E) if the population density exceeds 150 and this space has access to a settlement of more than 50,000 inhabitants within 60 minutes by road.
What happens to different isotopes of oxygen in this figure?
A) Evaporation concentrates lighter isotopes in the resulting water vapor.
B) Precipitation forms ice that is enriched in heavier isotopes relative to seawater.
C) Melting of ice preferentially releases heavier isotopes back into the ocean.
D) All of these are correct.