Explain how oceanic crust is created and destroyed
Oceanic crust forms from volcanism at midoceanic ridges (powered by melt from the mantle) before moving away like a conveyor belt. Where that plate reaches a subduction zone, it dives down into the mantle, where it will eventually melt.
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Which of the following goods and services is most likely to be found in the largest settlement?
A) hospital B) beauty salon C) supermarket D) restaurant E) drug store
Which of the following statements is true?
A) The valence electrons are only from s and p orbitals in the valence shell. B) All of the electrons in the valence shell are valence electrons. C) The valence electrons are always paired in the valence shell. D) Paired valence electrons are more unstable than unpaired valence electrons. E) Nonbonding electrons are not found in the valence shell.
Secondary rainbows occur when ____
A) two internal reflections of light occur in each raindrop B) light refracts through ice crystals C) a single internal reflection of light occurs in each raindrop D) light refracts through a cloud of large raindrops
Volcanic bombs originate ________
A) as blocks of volcanic rock ejected from an erupting volcanic crater B) as erupted magma blobs that partly congeal before falling to the ground C) as laser-guided, granite blocks launched from a supersonic jet D) as ash particles that join together in the eruptive plume and fall as cobble-sized objects