Answer:
So they can understand what is in the soil and how it changes
Answer: toeboard
Explanation: The Occupational Safety and Health Administration defines the Walking-Working surfaces regulation for the secure construction of stairs in industrial environments. For platforms or walls that are 4 feet or higher above the ground and do not have surrounding walls, it is mandatory to build a standard railing around them. In cases where there is a moving machinery, people can pass or there is an equipment which would be harmful when falling objects come in contact with it, the railings must have a toeboard.
A toeboard is an equipment fixed vertically to prevent items from falling for the platform.
The ~unequal~ statuses of different individuals in a society. for example, a doctor has a higher social status than a janitor working at the same hospital. the doctor might be awarded for his work, while the janitor is mostly ignored. the doctor may also have come from a fairly wealthy family and received a good education, while the janitor may have had economic disadvantages and a poor quality education. so the doctor and the janitor are socially unequal. social inequality is very closely connected to economic inequality, so if you ever see the phrase "socio-economic inequality," that's why.
