Gutter and rocket: what they have in common

1. Step 1. Gutter — uses — Gravity flow. Drainage.
2. Step 2. Gravity flow — is used in — Water filter. Water seeps through by gravity.
3. Step 3. Water filter — is made of — Silica (sand). Slow filters are layers of sand and gravel.
4. Step 4. Silica (sand) — is material for — Space Shuttle. The heat-shield tiles are silica fibre.
5. Step 5. Space Shuttle — has part — Solid rocket motor. Boosters.
6. Step 6. Solid rocket motor — evolved from — Rocket. Gunpowder rockets.

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