During embryonic development of animals, tissue layers form. this process of embryonic tissue development is called embryology morphology gastrulation germination

Gastrulation is the process in which tissue layers are developed. These layers of tissue later become organs and organ systems. Germination is a process restricted to plants while embryology and morphology are considered studies of the growth and changes in organisms.

Humans can affect weathering and erosion in several ways.  humans cause  increases in acid rain and pollution, which increase the amount of  weathering  agents in the air and water, and then on land.for an easy answer: 1) acid rain2) pollution