The nebula theory explains one way the planets were

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The Nebula Theory explains one way the planets were formed. Gravity also caused rocks to come together to form planets. The Frost Line is the distance in the solar nebula where it is cool enough for hydrogen compounds to condense into ice. It is located near the middle of the Asteroid Belt. Jovian planets are larger than terrestrial planets because they are able to hold onto lighter gases since the temps. Are considerably lower. Also, being so far away allows more room to grow. Planetesimals are a minute planet; a body that could come together with many others under gravity to form a planet. Yes, there are still planetesimals in our solar system. Moons on Jovian planets are formed of light rock and ice with very little heavy metals that tend to sink. The Solar Nebula is the cloud of interstellar dust and gas. Metals, dusts, and gases were emitted into space when the nebula collapsed. It began to flatten out like a Frisbee, in its center became the Sun and the cloud of gas rotating it became the solar system. The number of craters gives the age. Highlands is therefore older than Maria because highlands has more craters. Volcanism shaped moon’s surface - forming maria and highlands among others. None on moon. Mercury- The craters on the surface were formed from volcanism. No volcanic or tectonic activity now. Mercury’s Cliffs- When the core cooled, it contracted causing tectonic stress to form the cliffs. “Cannals” on Mars- He thought they were built by an advanced civilization to move water across the planet. Really, they were just canals formed by erosion The amount and size of craters vary depending on which hemisphere they are on ( Mars) There has not been any volcanism on Mars recently. There is hardened volcanic rock that shows there was volcanism at one point. There are volcanoes but they have been inactive for 10’s of millions of years.
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There was tectonic activity on Mars as seen by the creation of Valles Marineris. Mars has erosion caused by the ice from winter. As seen by in frost and dust storms. There might have been liquid water on Mars over 3 billion years ago. Water erosion tells us that. There are few large craters on Venus with no little craters due to the thick atmosphere. Venus has many lava plains and volcanic mountains. But, there have been no eruptions yet. Venus’ crust has contracted, causing fractures with regular patterns. There is no erosion on Venus because it’s too hot for liquid or ice on the surface. There are no plate tectonics on Venus due to the weak mantle convection or the lithosphere resisting fracturing. It would be reasonable to send an astronaut to Venus because it is the closest planet to us and we could learn from it. Plate tectonics on Earth affect the continents moving, seafloor spreading, and earthquakes. The continents on Earth were merged into one piece of land known as Pangaea 100’s of millions of years ago. How did the moons around Jovian planets form? Material remaining in the mini accretion surround the giant planets coalesced into small bodies.
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