An earthquake is one of the worst natural disasters on our Earth. We think that the ground we stand on is very stable, but it isn’t. It moves quite a lot. In the last few decades, scientists have been able to find out why earthquakes happen.

Earthquakes happen when there is a sudden vibration in the Earth’s crust. It’s like a large lorry that travels down your street. When it passes by, you feel your house shake.

Contents (23 pages)

• Introduction
• How plates move
• Where earthquakes happen
• Earthquake waves
• How earthquakes are measured
• Effects of earthquakes
• The greatest earthquakes in history
• Exercises
• Word list
• Key

Series of earthquakes in East Azerbaijan in 2012
Image: Mardetanha, CC BY-SA 3.0, via Wikimedia Commons

The human heart is a muscle that lies on the left of the chest. It is about the size of a fist. The heart is like a pump that sends blood around your body. Blood gives you the oxygen you need . An average heart pumps about 70 milliliters of blood into your body with every beat. That’s about 5 liters every minute or about 7200 liters every day.

Contents (14 pages)

• Introduction
• Parts of the heart
• Blood circulation
• Heartbeat
• Changing heart rates
• Heart attack
• How to keep your heart healthy
• Exercises
• Word list
• Key

Image: “Diagram of the human heart (clean)” by Wnauta is licensed under CC BY-SA 3.0.

An endangered species is a plant or an animal that faces a high risk of disappearing forever. Sometimes this happens because they have lost their natural habitat, at other times humans are the cause for such species becoming extinct. Among the most endangered species are tigers, rhinos, elephants, as well as tropical plants and trees.

Contents (18 pages)

• Introduction
• Why species become extinct
• Protection
• Some of the world’s endangered animals
• Endangered plants
• The World Wildlife Fund
• Exercises
• Word list
• Key

Endangered sea turtle
Image: 303sstevens, CC BY-SA 4.0 ,
via Wikimedia Commons

Electricity is the flow of tiny charged particles, mainly electrons, through a conductor, like a wire. It creates an electric current that powers our many devices and machines that we have in our household, from lights to computers.

Contents (22 pages)

• Introduction
• Parts of an atom
• Conductors and insulators
• Electric currents and circuits
• Types of electricity
• How batteries work
• Hoe electricity is produced
• How electricity is measured
• Power lines and transformers
• Electrical safety
• Exercises
• Word list
• Key

Image: FreeSVG.org , Public Domain

Galileo Galilei is often referred to as the founder of modern science. He made countless discoveries and built telescopes to study the stars and the planets.

Contents (8 pages)

• Text
• Exercises
• Word list
• Key

Image : Justus Sustermans, CC BY 4.0 via Wikimedia Commons

Coffee is one of the most popular hot drinks in the world. Almost a third of the world’s population drinks coffee. People often meet at cafés or coffee shops for a coffee break during the middle of the morning or stop work in the afternoon to drink coffee.

Contents (21) pages)

• Introduction
• The coffee plant
• Harvesting and processing coffee
• How coffee is brewed
• History of coffee
• Types of coffee drinks
• Coffee production and consumption
• Exercises
• Word list
• Key

Image: Cup of espresso coffee, FreeSVG, Public Domain