What is not true of a mixture?
a. A mixture is different substances closely intermingled.
b. A mixture is able to maintain separate properties.
c. A mixture is able to disperse homogenously.
d. A mixture may have varying concentrations and properties throughout.
ANS: C
A solution is heterogeneously dispersed. The substances in a mixture are not as evenly distributed and
keep their separate identities. Information can be found in the section Water Is a Powerful Solvent.
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Which type of rock forms below or on the earth's surface under intense heat and pressure when magma wells up from the earth's mantle and then cools and hardens?
A. igneous B. sedimentary C. mineral D. metamorphic E. organic
If Earth were in a warming trend, which of the processes below would most likely act as a negative feedback mechanism?
a. increasing the water vapor content of the air b. increasing the snow cover around the Earth c. decreasing the amount of low stratified cloud cover around the globe d. increasing the carbon dioxide content of the air e. decreasing the snow cover in middle and high latitudes
Jet streams are found within the ____
A) thermosphere B) tropopause C) stratopause D) exosphere
The most common minerals found in soils are combinations of which four elements, which are also the most common elements in Earth's crust?
a. carbon, hydrogen, oxygen, nitrogen b. silicon, aluminum, oxygen, iron c. potassium, zinc, copper, iodine d. silicon, hydrogen, oxygen, nitrogen e. carbon, aluminum, iron, potassium