News by Levels · Level 2 · For teachers

Teacher guide & answers

In this lesson: Link the observation period to mechanisms of recovery.

Landsat Research Reveals a Change in Mangrove Trends

How to use these two pages

Give learners the student worksheet. It contains the story and questions, without the answers. Keep this guide for yourself. Use it to lead the activity and explain the answers afterwards.

Student worksheet

A simple 15–20-minute lesson

Before reading · 2 minutes
Show the title. Ask: “What do you think this story is about?”
Read and answer · 8–10 minutes
Give out the student worksheet. Learners read for the main idea, then reread to answer the 2 questions. They can compare answers with a partner.
Discuss and write · 5–8 minutes
Check the answers below together. Ask learners to point to the clue in the story, then finish with the open question.

Adjust the support: Let learners use word help or Level 1 if needed. For a challenge, compare the wording in another level. This activity is not a proficiency test.

Answers to the 2 questions

The question numbers match the student worksheet. Each answer includes a reason and the clue learners can find in the story.

What period do the satellite images cover?
Correct answer: A — 1984 to 2023
Why: The first paragraph gives 1984 to 2023 as the research period.
Clue in the story: A November 13 NASA feature describes research using satellite images from 1984 to 2023. Global mangrove losses gave way to expansion around 2010.
Which pair explains the gains?
Correct answer: C — New ground and recovery of damaged forests
Why: The second paragraph names colonisation and recovery while preserving regional losses.
Clue in the story: The gains came from colonising new ground and recovering damaged forests, although losses continued in some regions.

The open question: accept different answers

Ask learners: Explain how the trend changed and why that does not mean losses ended everywhere.

One possible answer: Global mangrove losses were followed by expansion around 2010. New growth and recovery contributed, but the text says losses continued in some regions.

This is an example, not the only correct answer. Look for a relevant idea, a reason and the learner’s own words. Learners can answer aloud or write one or two sentences.

Grammar to discuss

A reversal in a trend

gave way to

Gave way to means losses were followed by expansion in the global trend.