Renewable resources are

a. things that cannot be replenished.
b. things that can provide heat but not other forms of energy.
c. things such as petroleum and coal.
d. things that can be naturally replaced in a short period of time.

Geographic earth materials modified over time by physical, chemical, and biological processes that serve many functions are considered a) equatorial parent materials b) modified soil horizons c) modified atmospheric materials d) nurtured dominant structures