There are about _____ in 2018

A: 5.35 billion people on Earth (the same as for the past 6 years)
B: 9 billion people on Earth
C: 10 billion people on Earth
D: 7.5 billion people on Earth


D. 7.5 billion people on Earth

Environmental & Atmospheric Sciences

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A parcel of saturated air at 20°C would have approximately ________ times ________ water vapor than saturated air at 0°C.



A) 5; more
B) 20; more
C) 5; less
D) 20; less

Environmental & Atmospheric Sciences

More developed countries (MDCs) have high gross domestic products (GDPs) and high energy uses

a. True b. False Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

The hydrogen bonding in water creates ________, a cohesive force that enables one to slightly overfill a glass with water or allows denser objects, such as a lengthwise steel needle, to float on water

A) surface tension B) capillary action C) friction D) heat exchange

Environmental & Atmospheric Sciences

Which of the following statements best describes how this object may have formed?

A. A star ejected its outer envelope of gas and plasma. B. Interstellar gas and dust accumulated due to gravity. Some pockets had enough mass to cause star formation. C. A supernova exploded, probably from the late-stage evolution of a high-mass star. D. Material accumulated into a sphere because of gravity, and it underwent nuclear fusion of hydrogen.

Environmental & Atmospheric Sciences