Genetic engineering is defined as a process by which a DNA (or other molecules of nucleic acid) can be artificially operated, alter and recombined so that an organism can be modified. In addition to this, modification of gene and cloning can also be done. This a human-operated system.
Genetic engineering is directly based on the study of a DNA, which is present inside the body of an organism, so it is considered as a human system.
Hoover Dam and the Panama canal are both human-made structures. Plate tectonics is a geological process that leads to the eruption of volcanoes and is a natural process.
San Gabriel mountain ranges are located in los angles country. These mountains are transverse ranges that lie between the desert and basins areas.
The ranges have rolling peaks and consist of a large number of canyons. The northern side of the mountain has a lower elevation as compared to the south-facing side.