Which event causes the formation of trenches in Earth's crust?

Study the following reaction carefully. what classification should this reaction have? 4al + 3o2 2al2o3synthesisdecompositionsingle replacementdouble displacement

To travel at constant speed, a car engine provides 24kw of useful power. the driving force on the car is 600n. at what speed does it travel?

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?