gravity - This holds planets in orbit around the sun, milky way - Our galaxy is called the ..., more - Jupiter is bigger than the earth so it has ..... gravity, billion - The big bang happened around 14 ..... years ago, evidence - Fossils matching in different continents are one piece .... for continental drift, africa - When looking at a world map south america looks like it fits together with ..., spreading - Continental drift is driven by sea floor ...., solid - What state of matter is the Earth's mantle?, outer core - Which part of the inner Earth is liquid?, boundaries - Earthquakes usually occur at plate ...., volcanoes - ..... often occur in similar locations to earthquakes, ten - The seafloor spreads at about ... cm a year, four - The Earth is at least .... billion years old, five - The solar system is at least .... billion years old, magnetic - Magnetic strips have been made in the seafloor due to the Earth's ..... field switching in the past,

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