In regard to the current state of e-wastes in the U.S., ________
A) only because of the actions of charitable organizations, the recycling rate is 5%
B) by EPA mandate, all metals in electronics have been replaced by biodegradable materials
C) although the recycling of e-wastes has improved, 60% of e-wastes are still being landfilled and incinerated
D) the recycling rate has dropped significantly between 1999 and 2010
E) because the EPA has classified e-wastes as toxic, more than 95% are being recycled
Answer: C
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Why has East Asia come to occupy a central position in climate change debates?
A) because the Kyoto Protocol originated in this region B) because South Korea leads the world in climate change research C) because of Japan's leading role in the solar energy industry D) because it will be the hardest hit region as climate change continues E) because of China's rapid increases in carbon emissions
The vertical movement of water due to changes in temperature and salinity is called Ekman transport
Indicate whether the statement is true or false
Walking along the woods, a student spot a lizard that quickly runs under some leaves that are resting on the forest floor. Looking under the leaves to find the lizard, he notices that the soil is very moist despite several days without rain
This moist soil layer under the leaves is a result of A) humus with a high water-holding capacity and reduced evaporative loss in the O horizon. B) sand with a high water-holding capacity with water supplied from the B and E horizon. C) low infiltration and high evaporative loss in the B horizon. D) a low water-holding capacity of the lower soil layers and high evaporation through the top soil layers.
In biological systems, aldehydes and ketones are reduced by which of the following?
A) NADH2 B) NADH C) NAD+ D) none of these