13. which best summarizes the change in number and size of microcontinents during the proterozoic?
a. the number of microcontinents increased and the size increased
b. the number of microcontinents increased and the size decreased
c. the number of microcontinents decreased and the size increased
d. the number of microcontinents decreased and the size decreased

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

If the new moon happens on january 15th, what shape will it be on february 6th?

On a geologic map, if the contacts between sedimentary rock units form a bull’s-eye pattern of concentric circles, with the youngest unit in the center, the underlying structure is a(n)