Question

4.2.4 quiz: effects of climate change
the maps show the recent past and projected future makeup of the forests of
the eastern united states. which tree types are expected to practically
disappear from the region shown?
current
1960 - 1990
projected
2070 - 2100
white - red - jack pine
spruce - fir
longleaf - slash pine
loblolly - shortleaf pine
oak - pine
oak - hickory
oak - gum - cypress
elm - ash - cottonwood
maple - beech - birch
aspen - birch
no data
a. oaks and pines
b. elms and cottonwoods
c. aspens and birches

Explanation:

Compare the current (1960 - 1990) and projected (2070 - 2100) maps. Look for tree - types that are present in the current map but absent or nearly absent in the projected map. Aspen - birch (represented by the purple color) is widespread in the current map but almost disappears in the projected map.

Answer:

C. Aspens and birches