express the diameter of the earth at the equator, 12700 km, in scientific notation

Explanation:

You must express whatever number you are given as something between 1 and 10. The rest is in powers of 10.

12700 = 1.2 which is between 1 and 10.

The rest is in powers of 10. You have to move the powers of 10 in the number of places you have to move the decimal.

To get to 1.2 you have to move the decimal 4 places. So the powers of 10 is

10 will be expressed as 10^4.

1.27 * 10^ 4  km

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.

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.