Which statement directly describes the diagram?

Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

Which is not true about balanced forces?