What is the formula of the compound formed between the ammonium ion and the carbonate ion?
A) NH4CO3
B) NH4(CO3)2
C) (NH4)2CO3
D) (NH4)3CO3
C
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Which of the following statements explains why stars are not visible during the day?
A. The light from the sun is too bright B. The light from the stars is absorbed and scattered by the atmosphere and does not reach the ground. C. The brightness of scattered light from the sky prevents the visibility of weaker light from the stars. D. The Earth is pointed away from the centre of the galaxy.
How is the Sahara Desert connected to the Amazon Rainforest? a. Warm air over the Sahara pushes moist air over the Amazon
b. Air masses first lose their moisture over the Amazon, drying out before reaching the Sahara. c. Moisture transpired from trees in the Amazon provide all of the Sahara's precipitation. d. Clouds seeded by Saharan dust keep the Amazon cloudy and cool. e. Dust from the Sahara is blown to the Amazon, where it contributes nutrients to the soil.
What type of volcanic material is indicative of eruption under water?
A) Pahoehoe flows B) Pyroclastic flows C) Lava aprons D) Pillow lavas E) AA flows
To meet the energy needs of all humans, we would need to capture
A) all of the sun's energy striking the Earth. B) all of the sun's energy just reaching the outer atmosphere. C) only about 1% of the sun's energy striking the Earth. D) only about 1/10,000 of the sun's energy striking the Earth.