(A car is traveling at a constant velocity of 60 km/h east for 4 hours.) Choose the correct statement about the acceleration of the car.
A. The acceleration of this car is zero.
B. The acceleration of this positive.
C. The acceleration of this negative.
D. The acceleration of this car is 15 m/s.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

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.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.