Silicon dioxide is dissolvable in water and has a high melting point because the atoms in the dioxide has a strong bond between them, which requires a lot of energy to break them.
Answer:
The crust and outer part of the mantle.
Explanation:
The crust and outer part of the mantle are the two top-most layers of Earth. The lithosphere is comprised of these two. Here's a picture for an example.
Answer:
Explanation:
Between about 800 and 1200 AD, partly in response to the new currents of trade, Africans in the southern sahel developed a set of trading states with an elaborate organization.Well before 1500 AD, a number of states had come into existence, that had no connection at all with the trade across the Sahara.
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Answer:
x=5
Explanation:
basically ext angle therom states the two give sides add up to the exterior angle. set them equal ba bam you got x = 5
