What is rubber? Rubber is a material which is elastic and waterproof.
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Natural rubber - Wikipedia
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Natural rubber - Wikipedia
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How Rubber is Made
Before plastic, rubber filled American homes
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What Is Natural Rubber and Why Are We Searching for New Sources? · Frontiers for Young Minds
How Rubber is Made (The Simple Version) - WetsuitsYou
Natural rubber - Wikipedia
What Is Natural Rubber and Why Are We Searching for New Sources? · Frontiers for Young Minds
