Name: 【TED-Ed】A guide to the energy of the Earth - Joshua M. Sneideman
Uploaded: 2014-08-11T12:20:03.000Z
Duration: 4 min 44 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

a physical quantity that follows precise natural laws.

with different properties and formulas to remember.

transfers 6 Joules of light energy per second.

to look at our planet, its systems, and their energy flow.

Energy moves in and out of these systems,

and during any energy transfer between them,

as heat, light, sound, vibration, or movement.

geothermal energy from radioactive isotopes

and rotational energy from the spinning of the Earth

while the Sun is the major external source,

Sunlight warms the surface and atmosphere

producing winds and influencing ocean currents.

The Sun is also the major source of energy

Now, as plants are eaten by primary consumers,

Since energy can only flow in one direction

from producers onto consumers and decomposers,

an organism that eats lower on the food chain,

So eating producers is the most efficient level

We travel, we build, we power all sorts of technology.

When we burn fossil fuels in power plants,

which, in turn, create magnetic field changes

causing electrons to be induced to flow in the wire.

Modern civilization depends on our ability

by direct interaction with light particles,

such as wind, water, geothermal, and biofuels

can also be used to generate electricity.

but the planet has limited energy resources