Photosynthesis is an example of a natural _________ , in which plants convert sunlight into energy.

Government _________ explain how to reduce carbon emissions which are released into the atmosphere.

There were high _________ of chemicals in the water, making it dangerous to drink.

The city council passed several _________ to improve air quality by reducing pollution levels.

Exhaust fumes _________ the environment and harm ecosystems.

Pollution from industrial waste _________ aquatic ecosystems by introducing chemicals that kill wildlife.

When you add sugar to water, it _________ and becomes part of the water.

Pollution _________ rivers by harming their fish populations and the people who rely on them for food.

Experts fear that soil contamination could harm _________ food security.

Pure water is _________ as it has a pH level of 7, which means it is neither acidic nor alkaline.

The concentration levels of contaminants in the two water samples were so close that the difference was _________ .

When boiled, water's _________ properties change from liquid to gas.

When water's pH level is lower than 7, it is _________ .

Toxic substances, such as certain chemicals and heavy metals, can be harmful to our health and the environment.

When carbon dioxide dissolves in water, it transforms into _________ acid.

Fish live in _________ habitats, such as oceans, rivers or lakes.

Desertification usually occurs in hot climates with very little rainfall, where vegetation dies due to a lack of water.

Urbanisation, the replacement of fertile land with cities and industry, seriously destroys the natural environment.

Marine dumping is a problem as waste pollutes the water and harms marine life.

Lots of large cities worldwide experience _________ smog, a mix of smoke, fog and pollutants.

Coastal _________ along the cliffs of Dover has resulted in land loss as sections of the cliffs have collapsed into the sea over time.

The old house is scheduled for _________ next week, and will be torn down because it is too unsafe.

Illegal logging is responsible for the complete _________ of the forest; nothing is left at all.

The extreme heat and _________ turned the area into dry land without any water.

The extreme heat brought the traveller to such a state of _________ that he could no longer walk.

The thick black _________ that came out of the factory's chimney were highly toxic.

The _________ that comes from older cars contributes to much of the air pollution in cities.

The city created a new waste _________ programme that allows residents to get rid of their rubbish in more responsible ways.

If not treated properly, the waste water from home _________ can pollute rivers.

No _________ to the programme were necessary; not a single change was made.

Global warming could have serious _________ for our planet, such as more frequent storms and rising sea levels.

Global warming _________ normal weather pom by causing more storms and heavier rain.

Please _________ of your litter in the bin instead of throwing it on the ground.

Many cities _________ waste in order to destroy it entirely.

Air pollution is harmful to humans because if we _________ toxic fumes, we can become ill.

The river's strong current has slowly _________ the cliff side over time.

The construction of new buildings can _________ the homes of several animals by destroying their habitats.

Marine populations _________ sharply in recent years, leaving fishermen with few fish to catch.

As the city grew and more buildings were built, the area began to _________ and lose its trees and wildlife.

Food sources for animals _________ when their natural habitat was destroyed.

The nail _________ deeply into the piece of wood, making it difficult to remove.