What is the main cause of climate change?

Do you know the difference between an environment and an ecosystem? In this lesson, you'll find out what makes an environment, and what makes an ecosystem. You'll also learn what ecology is and some of the ways that scientists study ecology using organisms, populations, communities, ecosystems and even the entire biosphere.

This video lesson will guide you in understanding the difference between climate and weather. Discover how they are different but related and how they are the ways you can describe atmospheric conditions on Earth.

The ocean waters are always in motion and as they travel around the globe they carry and distribute heat, which affects the global climate. Learn about the ocean circulation patterns and how they impact the climate.

Our hormones play a big part in how we feel and behave throughout the day. Hormones also affect important bodily functions. What other functions do our hormones regulate? Find out in this lesson on the endocrine system!

This lesson focuses on a group of organisms called invasive species. You'll learn what makes a species invasive and see some examples of invasive species. You'll also discover why invasive species are considered a problem and explore the impacts they have on the environment, the economy and on humans.

Ever look at a plant and wonder what each specific part is? A plant has two basic plant parts: the shoot and root systems. In this lesson, you'll learn and be able to identify each individual plant part within the shoot and root systems.

In this lesson, you will learn the importance of the ozone layer and how it is depleted. You will also study the research and policy that has been instrumental in its recovery.

Reduce, reuse, recycle! In this lesson, we will explore the three Rs of reducing solid waste. We will also investigate examples of each of the three Rs, and how people can do their part to help reduce solid waste.

The temperature in California is perfect! How did Californians get so lucky? Read about maritime and continental climates to find the answer, then test your understanding with a short quiz.

Do you know where the water in your area flows? In this lesson, we will explore the system of drainage basins and how they help develop river systems. We will also investigate some extreme examples of drainage basins.

What do humans, fish, and dragonflies have in common? They all go through a life cycle! Life cycles can be very different from animal to animal. This lesson describes the basic stages of life cycles, while noting some differences between animals.

Imagine making a list of all of the species you have ever heard of; it would be an enormous list! There are many different species on this planet. This lesson will explore the diversity of species, as well as the different types of diversity and how diversity of life is essential for maintaining healthy ecosystems.

Friction is a type of force that keeps objects in place or slows them down. This lesson explores friction in greater detail and provides examples of friction in action.

In this lesson, you will learn what latitude is and the general principles behind how it can be calculated. You'll also be provided with some examples of latitudes around the world. A short quiz will follow.

What should I wear today? Do I need an umbrella? Will we get a snow day? Knowing the weather is important for so many decisions we make. In this lesson, you will learn about the weather instruments used to help us understand and predict the weather.

Glaciers are huge blocks of ice that move along the landscape, carving distinct features along the way. Learn about the glacial erosion processes, plucking and abrasion, and the features they create, including cirque, horns, arête and roche moutonnee.