In a(n) ______ live chat, a chat window opens automatically.
A. proactive
B. agent
C. sidebar
D. broadcast
Answer: A
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What is a magnetosphere?
A) a region of space around a planet in which the planet's magnetic field can trap charged particles B) the layer of a planet in which its magnetic field is generated C) the uppermost layer of any planetary atmosphere D) the region in a planet's atmosphere in which auroras occur
The banded iron formations began to form when
A) carbon dioxide dissolved in seawater. B) varying oxygen levels allowed the precipitation of alternating layers of iron oxide. C) oxide minerals were deposited on the ocean bottom. D) iron from lava flows settled into layered formations.
An electric device delivers a current of 5.0 A for 10 seconds. How many electrons flow through this device?
A) 0.20 B) 20 C) 2.0 D) 3.1 × 1020 E) 31 × 1020
The strength of the Coriolis effect depends on
A) a planet's distance from the Sun. B) the amount of greenhouse gases in the atmosphere. C) a planet's size and rotation rate. D) a planet's temperature. E) the tilt of a planet's axis.