When the Sea Changes is a free printable Grade 3 science worksheet on judging a solution when people change an ocean habitat, aligned to NGSS performance expectation 3-LS4-4. It prints 2 questions with an answer key on its own sheet of paper, in 25 versions, 19 of them with different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.
Set 19 of 25 · the same problems every time you open this link.
Set 1 has all 25 in a single PDF. 19 of these 25 sets ask different questions — this skill does not have 25 questions to give. The rest reorder them, so no two students have the same paper in front of them.
When the Sea Changes
3-LS4-4
NameDate
Write your answer. Use the checklist.
1.A coral reef is turning white because the sea around it has warmed. Judge one solution.
Name the solution
Say which living things it helps
Say what it cannot fix
2.So many cod have been caught that few are left to lay eggs. Judge one solution.
Name the solution
Say how the cod would recover
Say who it costs
LessonPrint · 3-LS4-4 · Set 19 · free to copy for classroom use
Answer key — When the Sea Changes
Set 19. Prints on its own sheet.
1.A solution such as protecting the reef from other harm or growing new coral, the fish and coral it helps, and that it cannot cool the sea.
2.A solution such as limiting the catch or closing an area to fishing so the cod can breed, naming the fishing crews as bearing the cost.
Last reviewed 2026-09-05. Aligned to 3-LS4-4 of the Next Generation Science Standards.