Bar screens e LIGO: o que têm em comum

1. Passo 1. Bar screens — faz parte de — Sewage treatment plant. They catch large debris.
2. Passo 2. Sewage treatment plant — faz parte de — Sewerage. Treatment plants.
3. Passo 3. Sewerage — utiliza — Gravity flow. Waste water flows down a gradient.
4. Passo 4. Gravity flow — é utilizado em — Water filter. Water seeps through by gravity.
5. Passo 5. Water filter — é feito de — Silica (sand). Slow filters are layers of sand and gravel.
6. Passo 6. Silica (sand) — é material para — LIGO. The mirrors are fused silica.

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