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Be Smart

Why Does The Earth Have Layers?

Season 2 Episode 53 | 4m 31s

or why we live on an onion made of magma

Aired: 10/12/14
Extras
Watch • 8:32
Nature
NATURE - Season 45
Get a sneak peek at a brand new season of NATURE on PBS.
Preview: S45 | 8:32
Watch • 0:29
Nature
Preview of Sesame Street and the Great Elephant Adventure
Join Elmo and the Sesame Street gang on a once-in-a-lifetime African safari adventure.
Preview: S45 E1 | 0:29
Watch • 2:10
American Masters
American Pachuco: The Legend of Luis Valdez
Discover filmmaker and playwright Luis Valdez, a founding figure of the Chicano Movement.
Preview: S40 E6 | 2:10
Watch • 3:20
Antiques Roadshow
Appraisal: Colonial Revival Chair, ca. 1900
Appraisal: Colonial Revival Chair, ca. 1900
Clip: S30 E16 | 3:20
Watch • 1:54
Antiques Roadshow
Appraisal: 1925 Harriet Frishmuth Crest of the Wave
Appraisal: 1925 Harriet Frishmuth Crest of the Wave
Clip: S30 E16 | 1:54
Watch • 1:00
Antiques Roadshow
Appraisal: 1897 Arts & Crafts Humidor
Appraisal: 1897 Arts & Crafts Humidor
Clip: S30 E16 | 1:00
Watch • 2:01
Antiques Roadshow
Appraisal: Ming-style Reclining Chair, ca. 1900
Appraisal: Ming-style Reclining Chair, ca. 1900
Clip: S30 E16 | 2:01
Watch • 3:02
Antiques Roadshow
Appraisal: Jacob Hurd Silver Cann, ca. 1745
Appraisal: Jacob Hurd Silver Cann, ca. 1745
Clip: S30 E16 | 3:02
Watch • 1:39
Antiques Roadshow
Appraisal: Baltimore Album Quilt, ca. 1850
Appraisal: Baltimore Album Quilt, ca. 1850
Clip: S30 E16 | 1:39
Watch • 2:42
Antiques Roadshow
Appraisal: Painted Oak Settee, ca. 1900
Appraisal: Painted Oak Settee, ca. 1900
Clip: S30 E16 | 2:42
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