How does a seismograph detect and record seismic waves?

Generally, it consists of a pen attached to a fixed base which has paper placed on top. During an earthquake, the base and paper move and the pen does not. This records the spikes and movement of an earthquake.

b. the carbon cycle ensures living things have a source of hydrogen

answer by yourhope:

answer is

human impact on the environment can be seen in the deterioration of the !

: )