In this slideshow, students learn that nerve cells throughout your body respond to exteranl stimuli by sending impulses to your brain. This allows your skin to respond to things it touches and provide protection.

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.

Students are using geometric transformations to help them find the corresponding sides of similar figures in order to use their proportionality. The mathematics task is intended to be a problem or question that encourages the use of mathematical practices. The dialogue is meant to show how students might engage in the mathematical practices as they work on the task.

Students are provided with a scenario and asked to determine possible outcomes. The mathematics task is intended to be a problem or question that encourages the use of mathematical practices. The dialogue is meant to show how students might engage in the mathematical practices as they work on the task.

In this activity, students will make a variety of squares using square tiles and the Table feature of the TI-84 Plus C Silver Edition™ to discover patterns and make predictions off those patterns; Requires TI technology.

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.

In this task, students are investigating what sums of different types of numbers will produce. The mathematics task is intended to be a problem or question that encourages the use of mathematical practices. The dialogue is meant to show how students might engage in the mathematical practices as they work on the task.

Students use an applet to see how the volume and surface area of a rectangular prism and a triangular prism vary as their dimensions take on integer values from 1 to 14. A discussion and activity sheet with probing questions are included.

In this activity, students complete a bracket similar to the one used for basketball March Madness tournaments. In the first round, they add the charge for each listed ion; in the second round they combine the ions to form a neutral compound and write out the formula. Only one of the two compounds in each bracket from the second round will dissolve in water—move this compound on to the semifinals. When the two semifinal compounds in each bracket are both dissolved in water, two new compounds are possible; one is soluble and one will precipitate. The compound that is soluble moves on to the finals. The winner of the Chemistry Ion Tournament is the insoluble product obtained when the two finalists are dissolved in water.