Studies Documenting the Arrival of Spring and Fall in the Northern

question 40

Multiple Choice

Studies documenting the arrival of spring and fall in the Northern Hemisphere are based on:

• A) average daily temperatures as measured at locations throughout Northern Hemisphere.
• B) fixed calendar dates that have been consistent for the past 150 years.
• C) when buds of particular plants open and when the leaves of particular plants change color and fall.
• D) average snow melt, precipitation, and consistently increasing or decreasing temperatures across the state.
• E) the amount of pollution, particularly greenhouse gases, found in the atmosphere of that region.