Hardness in groundwater is due to the presence of metal ions. true or false

False

Explanation:

Water hardness in most groundwater is due to a natural occurrence caused by the weathering of  limestone, sedimentary rock and calcium bearing minerals. Hardness can also  occur locally in groundwater from chemical and mining industry effluent or  excessive application of lime to the soil in agricultural areas.

Limestone is not a metallic element or metallic alloy, although it does contain the metallic element calcium, it is not formed by the same processes as metals are.

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this