Which of the following is a common problem associated with irrigation?
A. Evaporation causes salt to accumulate in the soil.
B. Pumping water for irrigation lowers water tables.
C. The water that flows from irrigated fields is contaminated.
D. All of the statements are correct.
Answer: D
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When a particular solid sample is examined under a microscope it is observed that there are regions which are black and regions which are yellow. What type of material is this sample?
A) a compound B) an element C) a homogeneous mixture D) a heterogeneous mixture
As a result of country breezes, which of the following tends to happen to pollutants in the urban air?
A. They are concentrated. B. They are pushed to higher altitudes. C. They are pushed to rural areas. D. They are diluted.
Evangelista Torricelli, a pupil of Galileo, determined
A) atmospheric pressure is uniform in the troposphere. B) winds flow from airs of high to low pressure. C) large-scale circulations of winds. D) air pressure varied with weather conditions.
If a certain amount of heat is added to a 30.0 gram sample of water the temperature of the sample increases from 27.0°C to 57.0°C. If this same amount of heat is added to a 90.0 gram sample of water initially at 40.0°C what will be the final temperature of the water?
A) 30.0°C B) 50.0°C C) 70.0°C D) 90.0°C