Why is it Hot Underground?

The video discusses Lord Kelvin's theory that Earth started hot and has been cooling like a baked potato. Kelvin attempted to calculate Earth's age using temperature measurements, but his estimate was incorrect due to a lack of knowledge about radioactivity. The video explains that Earth's mantle is not rigid, allowing heat to spread through convection currents, which Kelvin did not account for. This process helps distribute heat from the core to the crust, influencing geological phenomena like volcanoes and plate tectonics.

What analogy did Lord Kelvin use to describe Earth's cooling process?

• A melting ice cube

• A baked potato

• A boiling kettle

• A burning candle

Why was Kelvin's estimate of Earth's age incorrect?

• He underestimated the size of Earth

• He didn't account for the heat from radioactivity

• He used incorrect temperature measurements

• He thought Earth was flat

How does radioactivity affect Earth's temperature?

• It only affects the atmosphere

• It has no effect on Earth's temperature

• It cools down the Earth's surface

• It generates heat in Earth's core

What is the role of convection currents in Earth's mantle?

• They cause earthquakes

• They prevent volcanic eruptions

• They cool down the Earth's core

• They distribute heat evenly throughout the planet

What geological phenomena are influenced by the heat distribution in Earth's mantle?

• Tsunamis

• Tornadoes

• Volcanoes and plate tectonics

• Hurricanes