How can you determine the relative age of strata in a bed of rock?

a. darker colored layers are older.
b. younger layers cover older layers.
c. layers that have fossils are generally older.
d. each layer represents about one million years.

The correct answer is B. Hope this helps!

1. a tropical dry forest carries out more rapid nutrient cycling

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.