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NASA satellites have mapped Earth's gravity and discovered mysterious spots where gravity is weaker; how earthquakes change the planet's gravitational field.
NASA satellites have mapped Earth's gravity and discovered mysterious spots where gravity is weaker; how earthquakes change the planet's gravitational field.
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Secrets of the Earth
S1, EP5 "Gravity"NASA satellites have mapped Earth's gravity and discovered mysterious spots where gravity is weaker; how earthquakes change the planet's gravitational field.
Secrets of the Earth
S1, EP6 "Goldilocks"Venus and Mars show how inhospitable Earth could have been if things were just a little bit different.
Secrets of the Earth
S1, EP7 "Magnetic Shield"Earth's metallic core makes the planet a huge magnet, generating a magnetic field that protects us from dangerous cosmic rays and solar energy.
Secrets of the Earth
S1, EP8 "Blizzards"Blizzards: it's one of the Earth's most beautiful secrets until it turns into a storm that can bring entire cities to a grinding halt.
Secrets of the Earth
S2, EP8 "The Birth and Death of the Planet"The development of Earth from its birth in the solar system 4 1/2 billion years ago through the cataclysmic events that created the planet we know.
Secrets of the Earth
S2, EP7 "Animal Invaders"Burmese pythons in the Everglades, snake-like fish in the Potomac, and killer bees swarming America: a lack of predators helps these invasive species to take control.
Secrets of the Earth
S2, EP2 "Abandoned Places"Volcanic destruction; oxidized auto plants and overgrown homes go under the microscope; seeking to uncover the secrets of earthly repossession.
Secrets of the Earth
S2, EP1 "Death Traps: Quicksand, Whirlpools & Riptides"Quicksand, grabbing unsuspecting victims in a mortal grip; whirlpools, the relentless swirls of water trapping entire boats in their swift vortices; rip currents, the hidden rivers of ocean water sweeping even strong swimmers beyond the waves.
