Which option was not an effect of gravitational push and pull on planetary embryos?
A) Embryos began to accrete particles from outside of their original feeding zones.
B) The original compositional gradients from inner to outer parts of the solar system imparted by varying condensation temperatures was blurred.
C) The embryo orbits crossed one another, setting up collisions that continued the planetary accretion process to the next stage ? the making of the inner rocky planets.
D) The speed of rotation was increased by accretion and some of the embryos began to break apart.
Answer: D
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A. The scientists didn't think photosynthesis could occur in such deep water. B. The organisms appear to originate from within mantle and are brought to the surface through convection. C. The entire food web is based on silicon instead of carbon. D. The organisms may represent some of Earth's earliest life forms, or even possible life on other planets.
The following image describes which type of change?
A. a physical change B. a change in reactivity C. a chemical change D. an elemental change E. no change
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A) Over oceans B) Over high mountains C) Over high latitudes D) Over tropical latitudes E) Equally over any latitude