Educational worksheet focusing on identifying the main idea and supporting details from a text about icebergs.

Let’s read the text carefully and break it down.

The text talks about icebergs — what they are, where they’re found, how they look, how they form, and what happens to them.

Step 1: Find the main idea.
The whole paragraph is explaining what icebergs are and some key facts about them. So the main idea should be a short sentence that covers the big picture — like “Icebergs are large pieces of floating ice with interesting features.”

But let’s make sure we pick something that fits all the details. The text says:
- Icebergs are made of fresh water.
- They float in cold oceans/seas/lakes.
- Most of them are underwater.
- They break off from glaciers or ice shelves.
- They melt when they reach warmer water.

So the main idea could be:
“Icebergs are large chunks of ice that float in cold waters, mostly hidden underwater, and eventually melt.”

Step 2: Pick three supporting details.
We need to choose three important facts from the text that help explain the main idea.

Good choices:
1. Only a small part of an iceberg is visible above water — most is hidden below.
2. Icebergs form when big pieces break off from glaciers or ice shelves in very cold places like Antarctica.
3. When icebergs move into warmer water, they start to melt and break apart.

These three details support the main idea by telling us what icebergs look like, how they’re made, and what happens to them.

Step 3: Fill in the paragraph frame.
“This text is mostly about” → We can say: icebergs and their characteristics.

“Some details that support the main idea are” → List the three details we picked, using commas and “and” before the last one.

Now let’s write everything neatly.

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Final Answer:

Main Idea:
Icebergs are large pieces of ice that float in cold waters, with most of their mass hidden underwater, and they eventually melt when they reach warmer areas.

Detail 1:
Only a small part of an iceberg is visible above the water; most of it is hidden underneath.

Detail 2:
Icebergs form when large chunks break off from glaciers or ice shelves in very cold regions like Antarctica.

Detail 3:
When icebergs float into warmer water, they begin to melt and break apart.

This text is mostly about icebergs and their key features.

Some details that support the main idea are only a small part is visible above water, they form from breaking glaciers in cold regions, and they melt when they enter warmer water.