the animation above, the overall amount of vegetation
covering North America increases and decreases over the
course of the year. These changes do not occur equally
everywhere. Some areas are never covered with vegetation,
and other areas remain green all year.
Possible questions that arise from these observations
might include the following:
- "Does the amount of rainfall in an area
directly affect the amount of vegetation?"
- "Is the amount of energy an area receives
from the sun closely related to the changes in the vegetation?"
- "Is the amount of vegetation in an area
dependent on the local temperatures found there?"