In this video, students learn that a food chain is made up of three groups producers, consumers, and decomposers who interact with each other in an ecosystem to get the energy they need.

In this video, students learn that food webs show all the relationships between all of the plants and animals in a community. How different food chains interact with one another and overlap is also explored.

In this video, students learn that limiting factors control the growth of a population in a certain population. Those factors can be living like predators, or non-living, like sunlight and rain. If these factors change, it can have a big effect on plant and animal populations. Inferences can be made about the relationships between plants and animals.

In this slideshow, magnetism is explored. The resource illustrates the idea that magnetism is the property of attracting iron and a magnetic object's magnetic force is how strong that attraction is. Magnetic fields are the areas where the magnetic force will work. Magnets also have opposite poles, negative and positive and opposites do attract.

In this slideshow, students learn that millions of years of heat and pressure turned the fossils of dead plants and animals into deposits of fuel, such as oil, natural gas, and coal. Fossil fuels are a non-renewable resource, and they create pollution, so it is important to conserve them.

In this video, students learn that heat is a form of energy. Heat is thermal energy that exists in matter. The faster an object's particles move, the more heat it has. Heat can be added to an object by making its particles speed up.

In this video, students learn that light is a very important energy source that keeps us warm and lets us see the world. Light travels in waves in bundles of energy. The video includes examples of light sources and shows that it travels in a straight line.

In this video, students learn that light always travels in a straight line until something gets in its way. When that happens, light can be absorbed, reflected (bounced off), or refracted (bent), depending on what kind of surface it hits.

In this slideshow, students learn that renewable fuels are energy resources that can be replaced in a reasonable amount of time. They are sometimes called alternative fuels because they offer an alternative to fossil fuels, which cannont be replaced.

In this video, students learn that sound is energy that travels as a result of vibration. It can be characterized by frequency, loudness and pitch. The relationship between sound and objects of the human body like eardrums are explored.

In this video, students learn that anytime there is a change in motion force is the responsible party. It has to overcome inertia to act on an object. Inertia keeps an object either sitting still or moving at a constant speed.

In this video, students learn that gravitational force is the constant force of attraction between the masses of two objects. The attraction between objects and the Earth is called gravity. Weight is caused by gravity: it is the measurement of gravity's force on an object's mass.

In this slide show students learn that igneous rocks are formed from magma. Magma exists inside the earth's surface, and it becomes lava when it is released through a volcanic eruption.

In this video, students learn that all matter can exist in three forms: solid, liquid or gas. They compare the basic properties. Matter can change states through heating or cooling, and it is sure to change when it reaches its boiling point or freezing point.

In this slide show, students learn that metamorphic rocks can be formed from sedimentary, igneous and even other metamorphic rocks. Students can view variuos examples of metamorphic rocks.

In this slide show, students learn about minerals and their physical properties such as luster, streak, color, hardness and structure. The slide show has many pictures to represent the various properties of minerals.

In this video, students learn inertia means that an object in motion will stay in motion in the same direction, or will stay at rest, unless another force acts upon it. For an object to change direction or stop moving, something has to overcome inertia.

In this video, students learn acceleration is the change in velocity. That means acceleration can mean a change in speed or direction.

In this video, students learn that energy does not change, and that means it is constant. When one object applies force to another, the energy becomes an equal and opposite reaction.

In this slide show, students learn that the sun is an average size star and the center of our solar system. One of the things surrounding it is an asteroid belt, and the four planets inside that belt are called the inner planets. They are: Mercury, Venus, Earth and Mars.