The early fish were jawless and armored, and inhabited shallow marine waters. Indicate whether the statement is true or false
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The seafloor spreading hypothesis indicates what as the primary cause of continental movement?
a. volcanism in the ocean crust b. convergence of tectonic plates c. the formation and destruction of ocean basins d. the convection of mantle heat e. the decay of radioactive isotopes
Instructions: Choose one answer from each pair of selections. The Younger Dryas that lasted from approximately 13,000 y.a. to 10,000 y.a. produced a WARM | COLD spell
Photochemical smog results from the interaction of sunlight with the combustion products of automobiles
Indicate whether the statement is true or false
Clay minerals are sheet silicates with flat surfaces that are ________ charged and attract ________.
A. negatively; water molecules B. neutrally; other clay minerals C. negatively; nitrogen gas D. positively; insects E. positively; carbonic acid