Which of the following is not a freshwater ecosystem? a . a river b . a lake c . an estuary d . a stream

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury