What does the ancient earthquake detector do? it help tell the direction of where it came from and the slightest movement will make the ball fall if you are referring to the ancient china one Edit
Depending on the type of lava flow, the resulting rocks look very different. This was a pahoehoe flow. A lava flow is caused by a volcanic eruption. The lava can flow down the volcano at speeds ranging from 1/24 to 50 meters an hour. They can be 1,300 degrees fahrenheit or more. They are very destructive.
TYPES OF LAVA. There are three categories of lava, classified on the basis of its silica (SiO2) content, which affects how readily it flows. 1. BASALTIC LAVA. a. Relatively low SiO2 content (less than 52%) b. Relatively low viscosity (flows readily when hot). 2.