In the 1970s,____________________were the most widely used propellants in spray cans, such as deodorants and hairsprays
Fill in the blank with correct word.
ANSWER: chlorofluorocarbons (CFCs)
CFCs
chlorofluorocarbons
?
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The geologic relationships in this figure indicate that
A) the lava flow pushed the trees over.
B) the lava flow overlies an angular unconformity.
C) the lava flow is younger than the landscape surface partially covered by the lava flow.
D) materials beneath the lava flow were uplifted from great depth.
Explain the connections between oxygen sag and biological oxygen demand (BOD). Use a drawing in your explanation and use appropriate labels.
What will be an ideal response?
The headwaters of a stream are where it empties to local or ultimate base level.
Answer the following statement true (T) or false (F)
In an ecosystem, throughput can refer to
A. energy that originates in the system and flows out. B. the equilibrium state. C. matter that flows into the system but not out. D. something that can expand the size of state variables.