Pillow lavas are ________
A) basaltic lava tubes erupted on the seafloor in volcanic piles analogous to toothpaste extruded from a tube
B) rhyolite glasses that develop a banding that resembles a pillow case with internal snowflake obsidian that looks like feathers
C) andesitic bombs erupted from a cinder cone that accumulate as pillow-like masses around the cone
D) basaltic magmas erupted on the seafloor as magma blobs from an explosive, submarine eruption
A
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All the following traits are variable in humans except
A) hair color. B) number of fingers. C) length of right index finger. D) length of neck.
The end point of an acid-base titration corresponds to which of the following?
A) The point where equal volumes of acid and base have been used. B) The point where the acid and base have been added in proper stoichiometric amounts. C) The point where a pH indicator changes color. D) none of the above
Why is the molten metallic outer core and the magnetic field important to life on Earth?
A) If we did not have the molten core and the magnetic field, the earth would not have plate tectonics and would be covered entirely by water. B) If we did not have the molten core and the magnetic field, we would be bombarded by meteorites and we would not be able to hold the moon in orbit. C) If we did not have the molten core and the magnetic field, we would be bombarded by cosmic rays that would strip away our atmosphere. D) If we did not have the molten core and the magnetic field, the atmosphere would be very different with either too much ammonia and methane or too little oxygen and water.
What were some of the tensions that existed between the British and French during the colonial era?
What will be an ideal response?