A nebula is a ________
A) bright star
B) black hole
C) faded star
D) cloud of gas and dust
E) small comet
Answer: D
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The western part of East Asia has an arid climate because
A. It has deserts B. It has many high mountain ranges C. It is furthest away from the rain bearing winds from the ocean. D. It is composed mainly of high plateaus.
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.
What is the structure of carbon dioxide an example of?
a. An element b. An atom c. A compound d. A polar molecule
Photosynthesis is a process by which nitrogen enters the atmosphere
Indicate whether the statement is true or false