What is formed when lava cools and crystallizes on top of the oceanic crust?

What causes the cyclical changes in the appearance of the moon?

For one week be an inventor and write down ideas for products or services that you think should be produced

One of the main reasons societies settled along rivers in the neolithic era was because a) the village elders demanded it. b) the land there was more valuable. c) it was more safe and secure there. d) it provided irrigation for farming.