How far is a light year?
A) nearly 10 trillion km
B) the distance of one Earth orbit
C) 300,000 km
D) all of the above
A
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What will be an ideal response?
If a surface, like a road, only has silt- and clay-sized particles, the particles will only be picked up by
wind if a car or other disturbance disturbs the road surface. Indicate whether the statement is true or false.
An important characteristic of aquatic dead zones is a ________
A) low concentration of nitrogen and phosphorus nutrients B) low concentration of oxygen C) high concentration of organisms resulting in extreme competition and finally the death of most D) low concentration of keystone species E) high concentration of urban development
In terms of the process of formation, which one of the following optical phenomena is unlike the other three?
A) halo B) solar pillar C) mirage D) sun dog