Gears of different sizes change the speed and of force. direction magnitude effort (i know its not this for sure) efficiency

How have the greenhouse gasses increased from the year 2000 to 2018

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks. energy was destroyed inside the blocks. energy was absorbed into the blocks from outside the system. energy was transferred from the warmer block to the cooler block.