Which Is True of the Concentration of CO2 in Our

question 20

Multiple Choice

Which is true of the concentration of CO2 in our atmosphere?

• A)It reached 400 ppm in 2013.
• B)The rate of increase leveled out in 1976.
• C)The level of CO2 was much higher in 1955 than today.
• D)The level of CO2 is decreasing at 3.1% per year.

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Definitions:

Affect

A term used in psychology to describe the experience of feeling or emotion.

Learning Disability

A condition giving rise to difficulties in acquiring knowledge and skills to the level expected of those of the same age, especially when not associated with a physical handicap.

Handwriting

The act or skill of writing formed by hand using instruments such as a pen or pencil.

Composition

The act or process of combining parts or elements to form a whole, often related to writing or the arrangement of musical pieces.