Which of the following is the best example of chemical weathering? a Limestone rocks dissolving in water

b Plant roots growing through concrete and cracking it

c Waves carrying sand away from a beach

d A large rock splitting into pieces because of ice

An exothermic reaction is conducted in an insulated calorimeter filled with water. the calorimeter is then sealed so that there is no heat exchanged between the contents of the container and the surrounding air. which of the following statements is true about the reaction?

What element has similar physical and chemical properties as boron.

Why must humans find substitutes for many minerals found on earth? (a) form at an extremely slow rate (b) controlled by other countries (c) too deep in the earth to collect