Which geologic era lasted the longest?

A) The Cenozoic

B) The Mesozoic

C) The Paleozoic

D) The Precambrian

Which of the following best describes repulsions? A. to push each other away B. an atom whose nucleus emits energetic particles to become a more stable atom C. to give off D. the changing of one element into another element

What needs more gas a heavealy loaded truck or an empty truck

When a solution labeled 0.50 m hno3 is diluted with water to give 0.25 m hno3, what happens to the number of moles of hno3 in the new solution?

How many seconds are in 2 days?

Water decomposes into hydrogen and oxygen when an electric current is applied. How many grams of water must decompose to produce 2 grams of hydrogen and 16 grams of oxygen?

Which of the following is the least reactive nonmetal,?

If the human body were a car, glucose would be:

Which part of the circulatory system contains blood rich in carbon dioxide (1) arteries (2) alveoli (3) veins (4) capillaries

Andrea was watching her brother in the ocean and noticed that the waves were coming into the beach at a frequency of 0.571429 Hz. How many waves hit the beach in 28 s? Answer in units of waves.

How many chloride ions are needed to cancel the 2 + charge of magnesium in magnesium chloride?