In addition to water, what things are necessary for an aquifer to form?

a. acid and porous rocks

b. porous rocks and a cave

c. water table and an impermeable rock layer

d. porous rocks and an impermeable rock layer

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Positive ions differ from neutral atoms in that

Sasha has just gotten a new job in a nearby city. after comparison shopping, she found that renting a nice two-bedroom apartment would cost around $800 per month. her utilities would cost about $150 per month. sasha has enough money saved for a down payment, and she found that she can buy a three-bedroom house or condo with a mortgage payment of $1,000 per month, including taxes and homeowner's insurance. her utilities would cost about $200 per month. what is the advantage of buying the house over renting the apartment?