What is compost made from?
AnswerDecomposed organic matter like food scraps and leaves
Composting lets microbes and small creatures break organic matter down into rich soil material.
Nature · Facts & stats
Use facts & stats
7 fact-checked facts about reuse and recycling, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What does 'upcycling' mean?
AnswerReusing waste to make something of higher value
Upcycling turns discarded materials into new products of equal or greater value or usefulness.
Going deeper
What is the number inside the triangle on plastic items called?
AnswerResin identification code
Numbers 1 to 7 identify the type of plastic resin; they do not guarantee an item is recyclable.
Plastic with resin code 1 (PET) is most commonly used for what?
AnswerDrink bottles
PET, code 1, is the clear, lightweight plastic widely used for water and soda bottles.
Which worms are most commonly used in home worm-composting bins?
AnswerRed wigglers
Red wigglers (Eisenia fetida) thrive in rich, shallow organic material, making them ideal for worm bins.
Expert level
Which ore is the main raw source of new aluminum?
AnswerBauxite
Aluminum is refined from bauxite; hematite is an iron ore, galena a lead ore and cinnabar a mercury ore.
Common soda-lime glass is made mostly from silica sand, soda ash and what?
AnswerLimestone
Soda-lime glass combines silica sand, sodium carbonate (soda ash) and calcium carbonate (limestone).
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