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.

In this slide show, students learn that Jupiter, Saturn, Uranus and Neptune are the outer planets of our solar system. There is a planetoid called Pluto out there, too.

In this video, students learn that the universe describes space and all of the planets, stars, galaxies, and other rmatter contained there.

In this video, students learn about a type of seed. Angiosperm plants reproduce by producing seeds inside a fruit. Students will learn that the pits in cherries from cherry trees are seeds. Several other examples of angiosperm plants are shared.

In this video, students learn that flowering plants have many parts that are required for reporduction. These parts work together to make seeds. The importance of bees in this process is discussed in the video.

In this video, students learn about another example of plants seeds. Gymnosperms are the oldest seed-baring plant. Students learn about their distinct appearance and life cycle.