Science
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4 Controlled burns are res that are purposely set within a designated
area when conditions are safe for the public and for the reghters
who watch over the re. Weather and forest conditions are monitored
both before and during the burn. Controlled burns rid forests of tree
limbs, dead leaves, and other debris.
Which prediction can be made about a forest after a controlled burn
has occurred?
A
The ability of plants to reproduce will decrease.
B
Important nutrients for new plant growth will be returned to
the soil.
C
Short-term air quality in the area will improve.
D
Long-term biodiversity will be reduced.
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5 Students are baking a cake. They mix together all the necessary
ingredients and pour them into a pan. Then they place the pan into
the oven to cook for 40 minutes.
Which statement BEST explains why baking a cake is evidence of a
chemical reaction?
A
The state of matter of some of the ingredients changed while
being cooked.
B
The total mass of the ingredients was the same before and after
they were cooked.
C
The temperature of the ingredients increased as they absorbed
thermal energy from the oven.
D
The ingredients formed a new substance after they were cooked in
the oven.
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