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Nuclear activity in the core of the earth forms convection currents within the mantle which upon reaching the surface tend to pull the tectonic plates apart, Continents which are resting on these plates will therefore move as this "conveyor belt" travels beneath them.

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How has our understanding of the earth's location in space changed of time?

Over time, our understanding of Earth's location in space has evolved from believing it was the center of the universe to realizing it is just one of many planets orbiting the sun in the solar system. Further advancements in astronomy have shown that the sun is just one of billions of stars in the Milky Way galaxy, and the Milky Way is one of billions of galaxies in the universe.


Has the amount of water on earth changed over time?

No, the amount of water on Earth has remained relatively constant over time. Water is continuously recycled through the water cycle, with some being stored in oceans, glaciers, lakes, and underground reservoirs.


How have valleys changed?

Valleys can change over time due to natural processes like erosion from rivers or glaciers, tectonic movements, or human activities like mining or agriculture. These changes can alter the shape, size, and ecology of the valley.


How have the continents changed over time in terms of their geological formations and positions?

The continents have changed over time due to the movement of tectonic plates. This movement has caused the continents to drift apart, collide, and shift positions. This process, known as plate tectonics, has led to the formation of mountain ranges, ocean basins, and other geological features.


Which land form is most changed by the force of gravity over time?

Mountains are the land form most changed by the force of gravity over time. Gravity causes erosion, landslides, and the shifting of tectonic plates, which all contribute to the constant changes in the shape and height of mountains.