Which of these best describes a scientific 1. a rule made by a government 2. a rule that does not depend on observable evidence 3. a statement which varies under the same conditions 4. a statement about how things act in the natraul world

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

Ase your answer to this question on the information below.hydrocarbons and fissionable nuclei are among the sources used for the production of energy in the united states. a chemical reaction produces much less energy than a nuclear reaction per mole of reactant.the balanced chemical equation below represents the reaction of one molecule of a hydrocarbon with two molecules of oxygen.chemical equation: ch4 + 2o2 → co2 + 2h2o + 1.48 × 10−18 jthe nuclear equation below represents one of the many possible reactions for one fissionable nucleus. in this equation, x represents a missing product.nuclear equation: write an isotopic notation for the missing product represented by x in the nuclear equation.

Can someone me with 3 and 4 plz. this is for masteries test.