This is an interactive resource that allows students to explore the immune system. First, students view a slide show on the topic. Next, they can test their knowledge with an interactive test.

In this slide show, students learn that Earth's moon reflects the sun, and so it is visible at night. It also rotates at the same rate that it orbits, 29.5 days, which means that we only see one side of it. The moon has one-sixth of the gravity of Earth and no atmosphere at all. Phases of the moon are also illustrated.

In this video, students learn that rock is a hard, solid material, consisting of one or more minerals, that makes up the Earth. Rocks continuously change from one type to another through the rock cycle process. There are three types of rocks: igneous, sedimentary and metamorphic.

In this video, students learn that volcanoes produce some of the Earth's most violent geologic changes, but they are not always violent. Different kinds of volcanoes produce different kinds of eruptions.

In this video, students learn that weather is a condition of the outside area at any time or place, and it is constantly changing. The climate, on the other hand, gives the big picture, or what the weather is like over a long period of time.

In this video, students learn that weather conditions are influenced by global weather patterns. When the Earth's air masses run into each other, the place where they meet is called a front. Fronts are responsible for all kinds of weather like snow.

In this video, students learn that changes in air pressure causes wind. The Earth's rotation also helps. Students explore how wind direction and speed affect global patterns and influence weather.

In this video, students learn that the water cycle is the constant movement of water through the Earth and its atmosphere. Water on the ground evaporates, becoming water vapor. The vapor rises, becomes clouds, and then falls back to the earth as rain, snow, sleet or hail.

In this video, students learn weather conditions are influenced by water currents. They also learn that a wave carries energy on the ocean's surface. Waves can be big like tsunamis, or small. A current is the constant movement of the water in the ocean, and there are different kinds of currents, defined by their characteristics and location.

In this slide show, students learn about various instruments that can be used to measure the weather. Some examples are the thermometer, hygrometer, anemometer, barometer, rain gauge and the wind vane.

In this video, students learn that weathering and erosion are continuous processes that gradually change the natural environment over time. Weathering is the process of wearing down materials into sediment. Erosion occurs when this sediment is moved.

This online interactive provides a step by step tutorial on classifying angles. Students are also able to test their knowledge to see how well they understand classifying angles.

In this online interactice, students practice rounding by estimating whole numbers. A step by step interactive tutorial assists students with problem solving. After the interactive tutorial, students can test their knowledge by taking a quiz.

In this online interactice, students practice rounding decimals to the nearest whole number. A step by step interactive tutorial assists students with problem solving. After the interactive tutorial, students can test their knowledge by taking a quiz.

From Scholastic Inc., this lesson guides students through citing textual evidence in an informational article. Includes the article, vocabulary and students worksheets.

This video teaches students how to write legibly in cursive on notebook paper.