Earth’s crust continuously melts and solidifies in the upper mantle. why does oceanic crust solidify faster than continental crust? a continental crust spans a wider area and is generally thinner than oceanic crust. b magma beneath oceanic crust is a lower temperature than magma beneath continental crust. c when magma comes into contact with ocean water it cools faster than when it reaches continental rock. d salt in ocean water accelerates the solidification process by way of chemical reaction.

Which group of chordates does  notpossess true backbones?                 a.  birds      b.  frogs and toads      c.  lampreys      d.  crocodilians

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?