What is the driving force for convection currents on earth?
(what makes convection currents possible on earth/ where does the heat that is needed for convection currents to occur from? )

The first element on the periodic table of elements is carbon. a. true b. false

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

Given the following reaction: c3h8+5o2=3co2+4h20 how many grams of co2 will be produced 7 g of c3h8 and 98 g of o2