Which of these is a characteristic of index fossils? 1. Found in the topmost rock layer
2. Found in many layers of the same rock
3. Have already established relative age
4. Are limited to a particular geographic location

Explain how a convection current in the earth is formed.

Equilateral triangle pbj is inscribed in a circle as shown. determine the measure of arc pjb.

Which statement about factories in the industrial revolution is not true? a) some of the first advances were in textile mills b) spinning machines used water power c) water power was replaced by steam power d) coal was imported to english factories for power answer d) coal was imported to english factories for power