Which of the following is considered by biologists to be a likely place where life might have first arisen on Earth?
A) on land surfaces that got moderately heavy rainfall
B) in hot water near undersea volcanoes
C) deep in Earth's core
D) on meteorites that landed on Earth
B
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The fundamental unit of the silicon-oxygen minerals is in the shape of a
a. cone. b. tetrahedron. c. cube. d. sphere.
Understanding wind movement is increasingly important as wind power becomes more common. Wind turbines are driven by air and create electricity, so faster air means more power. Air close to Earth's surface doesn't move as quickly because it is slowed by friction with Earth's surface. Wind turbines are tall in order to access the faster-moving air above Earth's surface. Which of the following options describe the features of the ideal location to erect wind turbines in order to generate the most electricity? Select the two that apply.
This figure shows frames from a computer simulation of star formation, starting at the left with a large molecular cloud measuring more than a light-year across. What is happening as time passes (from left to right)?
A) The cloud is fragmenting into smaller pieces that will form stars. B) The cloud is developing hot spots that shine more brightly within it. C) Magnetic fields are forcing the gas to align in intricate ways along twisted magnetic field lines. D) The cloud has been hit by a shock wave from a nearby stellar explosion, which causes the gas to move violently around.
Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in opposite directions,
A) the wires pull toward each other. B) one wire is lifted slightly while the other wire is forced downward against the table's surface. C) both wires are lifted slightly. D) the wires push away from each other.