This unique group of plant fossils represents important evidence supporting plate
tectonics.
a. Pangaea d. Cynognathus
b. Gondwana e. Curie point
c. Glossopteris flora
C
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If we could immediately halt the worldwide production of CFCs, approximately how long would it take to return the level of the ozone in the stratosphere to pre-1950s levels?
A. 100 years B. 10 years C. 60 years D. 1000 years
The wind-chill index
A) takes into account infrared solar radiation. B) assumes people are wearing a basic layer of clothing. C) uses the same variables as the heat index does. D) does not consider whether or not a person is engaged in physical activity.
Match the type of atomic bond with the correct definition
A) Valence electrons are free to move from one atom to another so all atoms share available valence electrons, creating an electron "sea." B) Incomplete transfer of electrons that results in atoms partially transferring and partially sharing electrons. C) One atom gives up one or more valence electrons to another atom. D) Chemical bonds created by sharing a pair of electrons between atoms. 1) Ionic bond 2) Covalent bond 3) Metallic bond 4) Hybrid bond
The pH of seawater is regulated by its ________.
A. temperature B. carbon dioxide concentration C. pressure D. oxygen