This Catalyst article describes how the salty water in the oceans has some consequences for how the ocean water mixes – or does not mix. There are distinct bodies of water in the oceans which mix only very slowly. The experiments detailed in the article will explain why this is.

The article is from Catalyst...

In this resource from the European Space Agency, students design and develop an entire space mission to Mars. The objective of the mission is to send a programmed LEGO rover to the surface of the Red Planet to study changes in state of water. Students take temperature measurements and interpret the data collected...

The spacecraft that have orbited around Mars and landed on its surface have shown us (via images and data) that there is no liquid water on the surface of Mars. However, these satellite images have also revealed to us features that appear to have been created or carved out by flowing water. In fact, scientists feel...

Scientists must design and evaluate many ways of extracting water from the lunar permafrost before planning lunar colonies and manned missions using the moon as a base.

In this activity students will construct a solar water collector. Using the collector, students will collect and calculate the amount of...

In this set of three activities, pupils will spend a day recording how much water a person uses in an average day, followed by an experimental activity where they will use ‘lunar ice cores’ and filter them to get water. Through these activities, pupils will learn how a filtration system can be used to separate...

In this lesson students look at the related concepts of pressure and force (pressure = Force/ Area), units used, measurement and how a large force can result from pressure acting over a given area. They will move from calculating the weight (under gravity) of a column of water or air to the pressure of this as...

These fact sheets for secondary aged pupils explore hard and soft water and an activity to test for hard water. They also look at how fresh water is needed for every part of our lives, and how access to clean water is becoming increasingly difficult with a growing population and changing climate so discovering new...

These fact sheets for primary aged pupils explore the how fresh water is needed for every part of our lives, and how access to clean water is becoming increasingly difficult with a growing population and changing climate so discovering new supplies and managing water carefully is more important than ever.

• This annual competition is run by the National Physical Laboratory and challenges students to launch a rocket powered by water or air pressure and see how long they can keep it in the air, whilst trying to earn additional bonus seconds by landing it in designated...

This activity sheet builds on students' knowledge of separating mixtures and looks at how and why water is treated.  There is also an extension activity which looks at the importance of oxygenation of lake water.

This resource requires students to consider where their water comes from and what life would be like if it were not readily available. It examines the importance of the water we use being clean and the consequences if that water is not clean. Students investigate simple ways of making dirty water clean and...

This resource, from Siemens UK, encourages students to appreciate the importance of clean water and the problems that may arise in the absence of it. Students consider soluble and insoluble pollutants and methods of filtration. They then explore contamination by microorganisms, water-borne diseases and the...

These resources from the Institution of Engineering and Technology, produced in association with Fairfield Control Systems, explore the theme of waterways.

A Catalyst article looking at renewable energy. To tackle climate change and all the challenges imposed by the need to find alternative and reliable energy sources, there is one major resource that has remained untapped until now: wave power. This article describes the size of this resource and presents the leading...

Comparing two sine waves of different amplitudes, this video shows that the intensity of a wave is proportional to the square of the amplitude.  The intensity is given I = ^P/_A, i.e., power per cross-sectional area.