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The beginning of the ________ era is marked by the appearance of the first life forms with hard parts.
Q17: abyssal plain clay<br>A)biogenous<br>B)terrigenous<br>C)hydrogenous
Q23: _ sediment consists of shells and hard
Q25: A variety of techniques and efforts are
Q27: Repeated eruptions of relatively fluid lava from
Q29: Manganese nodules do not accumulate below 4500
Q36: Marine organisms are influenced by a variety
Q54: Which one of the fogs listed below
Q66: Steppes are the driest of the true
Q70: _ tend to increase the explosive potential
Q80: The Basin and Range region of the