In winter, sand from some beaches disappears. Where does it go?
a) The sand becomes buried in mud.
b) The sand moves down the continental margin to the deep sea through submarine canyons.
c) Winter wave action moves the sand offshore into bars, located just below the wave base.
d) The sand is stuck in rivers until the winter waves subside.
e) The sand is covered up by rocks brought in by strong winter waves.
C
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Fill in the blank(s) with the appropriate word(s).
Sedimentary layers in which grain size decreases from bottom to top are called graded beds. Indicate whether the statement is true or false
Basalt and gabbro are the rocks that crystallize from mafic magma
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When a solution of Cu(II) chloride, CuCl2 , is added to a solution of potassium sulfide, K2S, a black precipitate of copper sulfide, CuS, forms. Which of the following is the net ionic equation for this reaction?
A) CuCl2(aq) + K2S(aq) ? CuS(s) + 2 KCl(aq) B) Cu2+(aq) + Cl22-(aq) + K22+(aq) + S2-(aq) ? CuS(s) + K22+(aq) + Cl22-(aq) C) Cu2+(aq) + 2 Cl-(aq) + 2 K+(aq) + S2-(aq) ? CuS(s) + 2 K+(aq) + 2 Cl- (aq) D) Cu2+(aq) + S2-(aq) ? CuS(s)