Answer:
The Permeable rocks are rocks such as sandstone, chalk. The Impermeable rocks are rocks such as clay, slate, marble, and granite. Sometimes however, they do vary.
Explanation:
A permeable rock is a rock that has interconnected pores and allow passage of fluids and impermeable rocks are rocks that do not allow fluid to flow.
Answer:
As agriculture increased, more farming machines were used.
Productive Resources are resources used to make goods and services.
Therefore the best possible option is the last one - Factors that are used to make goods and services.
P is parentheses
E is exponents
M is multiplication
D is division
A is addition
S is subtraction
