People have thought that everything had went around the earth Our understanding of the universe has changed over time. Different civilizations have created different models to explain what the universe
is and how the universe began. The Greek astronomer Ptolemy
used measurements of the sky to create his geocentric model. This had the earth at the center and all the planets and the sun orbiting around it.
Electron
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Answer:
1. Hot air is less dense then cold air therefore it is lighter the cold air. Because the hot air is less dense it helps lift the balloon up and because cold air is more dense it is heavier and helps the balloon slowly drop the balloon.
To be honest I don't know what 2 is but hope this helps some!
Answer:
The rock changes into a Metamorphic rock
Explanation:
Usually, metamorphic rocks start out as some other type of rock, either igneous, sedimentary or even a metamorphic rock. The process of transformation is known as Metamorphism.
When a rock sitting on the surface of the earth is pushed down deep into the earth over time and is exposed to tremendous heat and pressure over time and does not melt, it changes into a metamorphic rock.
A metamorphic rock is formed from a combination of factors such as tremendous heat, high pressure, hot fluids rich in minerals which are all found deep down in the earth.
