How long has there been life on earth?

a. 4.6 billion years,

b. 3.7 billion years,

c. 65 million years,

d. 3 million years

What happens as the two air masses collide

The amount of atomic particles released by a radioactive material in a specific time is determined by

Can you give an example of a dramatic climate change that could occur in the near future?

A compound is found to be 38.76% calcium, 19.97% phosphorous and 41.28% oxygen. What is the empirical formula for this compound?

How does hydrogen and oxygen form water

Before oceanography was recognized as its own branch of science it was part of A. Physics B. Chemistry C. Geometry D. Natural science

For a chemical reaction to be spontaneous at all temperatures, which of the following conditions must be met? a. ΔS° > 0, ΔH° > 0 b. ΔS° > 0, ΔH° < 0 c. ΔS° < 0, ΔH° < 0 d. ΔS° 0 e.

What is a Binary Compound? Is it related to the Ionic and Molecular compounds? if so, how so?

Which answer correctly describes the difference between covalent and ionic bonds? A. ionic: transfer of protons covalent: transfer of electrons B. ionic: transfer of electrons covalent: transfer of protons C.

What are the first five elementsof the periodic table?