Problems/Recycling Materials

Which of the following substances is thought to be one of the main greenhouse gases?

• soot

• nitrogen oxide

• sulfur dioxide

• carbon dioxide

Which of the following explain what a non-biodegradable polymer is?

• a polymer that breaks down when buried in the soil

• a polymer that burns in air to form carbon dioxide and water

• a polymer that doesn’t break down when buried in the soil

• a polymer that does not burn when heated in air

Which of the following best explains why low levels of toxins released into the sea by factories can cause serious problems to humans?

• The toxic materials release heat, which is causing global warming.

• The toxin levels increase in the larger animals up the food chain.

• The toxin levels in the water increase as the toxin molecules react.

• The toxins increase acid levels in the water and damage water life.

Which of the following would help reduce the possibility of global warming occurring?

• Burn less fossil fuels.

• Remove sulfur from all fuels.

• Use more biodegradable plastic bags.

• Remove all toxic materials from factory waste.

How are landfill sites used to deal with waste materials?

• They burn the waste to produce energy.

• They spread waste on or bury it in the ground.

• They sort most of the waste items so they can be reused.

• They melt the waste together to form large solid blocks of material.

Recycling a metal will help us be able to use that metal further into the future because:

• recycled metals cost less.

• it won’t use up landfill space.

• recycled metal objects usually last longer.

• recycling saves our reserves of metal ores.

Which of the following materials is recycled, by crushing and grading, to make aggregate for building foundations?

• paper

• wood

• concrete

• polythene

The most important reason for recycling glass is that it saves large amounts of:

• sand.

• trees.

• energy.

• limestone.

This material is collected and separated by colour, before melting. The main advantage of recycling this material is in the savings in energy costs.

• concrete

• polymer

• metals

• glass

This material is separated into different types before melting. Recycling some of these is now essential as the sources of their ores are running out.

• concrete

• polymer

• metals

• glass