Recycling quiz

More questions about Recycling

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   Recycling paper reduces the need for fresh pulp made from what?

   Answer: Trees

   Why: A ton of virgin copy paper takes 24 trees; a recycled ton takes none, uses 31 percent less energy and halves the wastewater.

2. 2 Medium

   In Europe and the Americas, what releases the most microplastic into the oceans?

   Answer: Tire wear

   Why: The IUCN's global study traced about two thirds of primary microplastic losses to road runoff, ahead of wastewater at a quarter.

3. 3 Hard

   What process uses a rotating magnetic field to repel non-ferrous metals?

   Answer: Eddy current separation

   Why: A fast spinning magnet rotor induces eddy currents in aluminium and copper; the two fields repel and fling the metal off the belt.

4. 4 Easy

   What does recycling do to landfill waste?

   Answer: diverts it to new products

   Why: In 2018 the US landfilled 50% of its municipal waste and recycled or composted 32.1%, the EPA's latest full figures.

5. 5 Medium

   Aluminum recycling saves 95% of the electricity used in which stage?

   Answer: Smelting bauxite ore

   Why: Electrolysis alone eats about 14,000 kWh per tonne; primary metal costs 186 GJ a tonne from mine to cast house, remelted scrap only 8.3.

6. 6 Hard

   What makes Pyrex cookware ruin whole batches of recycled glass?

   Answer: Higher melting temperature

   Why: Because borosilicate melts at higher temperatures than container glass, it forms unmelted solid inclusions that structurally weaken new jars.