Hourglass wooden frame e liquid-propellant rocket engine: o que têm em comum

1. Passo 1. Hourglass wooden frame — faz parte de — Hourglass. A protective frame.
2. Passo 2. Hourglass — utiliza — Gravity flow. Sand pours through under gravity.
3. Passo 3. Gravity flow — é utilizado em — Water filter. Water seeps through by gravity.
4. Passo 4. Water filter — é feito de — Silica (sand). Slow filters are layers of sand and gravel.
5. Passo 5. Silica (sand) — é material para — Space Shuttle. The heat-shield tiles are silica fibre.
6. Passo 6. Space Shuttle — tem como parte — Liquid-propellant rocket engine. Hydrogen-fuelled main engines.

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