Two boats in a flowing river or sailing side-by-side with only a narrow space between them what happens to the fluid speed in the pressure between the two boats

What is driving behind plate tectonics (plate movment)? a) gravity only b) inertia c) convection and gravity d) the sun theres no option for science so i picked chemistry. plz

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?