(Redirected from List of longest bridges in the world) This is a list of the world's longest bridges more than three kilometres long sorted by their full length above land or water. Span refers to the longest spans without any ground support. Note: There is no standard way to measure the total length of a bridge.
But the smaller crystals mean that the rest of the cooling happened very quickly. If a rock has both crystal types, it means that the mamga spent some time in a magma chamber, where the large crystals grew, then was violently erupted onto the surface, where the small crystals were formed.
It also contains rare chemical elements. The minerals formed from this type of magma are often valuable because they have concentrations of rare chemical elements. When magma cools very slowly, very large crystals can grow. These mineral deposits are good sources of crystals that are used to make jewelry.For example, magma can form large topaz crystals.he different colored speckles in the granite are the crystals of the different minerals. The mineral crystals are large enough to see because the magma cools slowly, which gives the crystals time to grow. Figure 3.20: Granite is a type of rock that forms from magma.