How do temperature, pressure, and density impact the core of Earth?

The asthenosphere is semi-fluid and always in motion. This movement is caused by the heat in Earth and creates convection currents. Convection currents are circular movements based on temperature and density. The heat from deep inside Earth heats up the semi-fluid particles of the asthenosphere. These particles then become less dense and rise. As they rise to the bottom of the crust, they cool off, become denser, and move back toward the core. Back at the core, their temperature will increase again, causing this circular motion to continue.

Convection currents in the asthenosphere cause movement of Earth's tectonic plates. The crust, though rigid, is broken into a series of tectonic plates that fit together like pieces of a puzzle. The plates float on the semi-fluid asthenosphere and move around in predictable directions. It's like a giant conveyor belt moving molten material from one place to another and causing the plates that float on top to slide to new locations.

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acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

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