THE AMERICAN FARM puts viewers on the front lines of the fight to go from seed to stalk, and from farm to fork. It's an honest, true tale of risk and reward.

Geomorphology is the study of landscapes and their individual landforms. Learn the five major influences on landscape formation. Use this background to tour the United States, which is a remarkable laboratory of geomorphology with features such as the Appalachian and Rocky Mountains, the Grand Canyon and Channeled Scablands, and more.

Check out limestone, one of nature's most amazing rocks, with medical, economic, and sightseeing benefits. Not to mention, limestone provides insight into environments eons ago. Examine its chemistry and the ways it forms. Survey different kinds of limestone, including types that preserve detailed fossils. Finally, look at sinkholes and caves, which occur in limestone karst topography.

Soil may be the most important geologic resource on the planet. Discover how geologists classify soils, focusing on the concept of soil horizons, which are distinct layers that often vary in composition, color, and texture. Analyze how this cross section, which signals soil fertility, differs depending on the type of biome. Learn how soils form and how easily they are destroyed by erosion.

In seven locations in North America and Europe, we observe miners, engineers and foremen at work. They enjoy it-who wouldn't like operating one of those massive excavators? Nevertheless, there's a feeling of unease. Sometimes a fossilized tree turns up and is saved for a museum-if the bulldozer hasn't already smashed it, that is. When asked, the workers are well aware of the consequences for nature, climate and safety. But it's work, and there's a...

The most highly prized rocks among non-geologists are gemstones. This episode covers all 12 birthstones, plus other gems, probing the shifting categories of precious and semi-precious gems. You learn how gems form and where to find them. Even more difficult to find are meteorites. Hear tips for identifying these extraterrestrial rocks, which are unlike anything native to Earth.

Having studied igneous rocks that cool quickly, now turn to igneous rocks that cool deep underground over the course of millions of years. Find out how to distinguish granite from diorite, gabbro, and other intrusive igneous rocks. Learn about notable batholiths, such as Yosemite's Half Dome, and look at the abundant uses for granite and similar rocks.

Sedimentary rocks make up a substantial majority of rocks at Earth's surface. In this episode, focus on clastic rocks, which are composed of broken fragments of pre-existing rocks. The fragments can vary in size from clay particles to silt, sand, gravel, and larger pieces. Learn how these rocks form and the rich stories they tell about the past.

The people and their labor are bound to the land in the cycle of activities to the sowing to the harvesting of wheat. Without narration or subtitles, the film conveys a sense of unity between the people and the land.

Emily Graslie embarks on a journey through billions of years of Earth's history. Along the way, she meets some of the planet's earliest lifeforms - from primitive bacteria to giant reptiles, and many surprising creatures in between.