Why does plastic flow only occur below 15 meters of ice

What structure on the south african coast has a range of 63 km and releases flashes every 30 seconds?

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

Who developed the theory of plate tectonics?