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Answer Key
Grade 4 ELA: Informational Structures & Features
1.
how coral reefs form, change, and face problems
2.
First, Next, Over decades
3.
Because... polyps need sunlight; when water grows cloudy...
4.
Fringing vs barrier reefs — location differs
5.
Pollution damages coral; biologists plant fragments
6.
tiny animals that build reef
7.
algae in polyps need sunlight
8.
polyps expel algae when stressed
9.
chronology, cause and effect, compare and contrast, problem and solution
10.
cloudy/warm water → bleaching
11.
fringing vs barrier reef location
12.
polyps settle on hard surfaces
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