Select the correct answer. Density is mass divided by volume (d = m ÷ v). Based on the graph, what happens to a fixed mass of water when it is cooled from 4°C to 0°C? A. volume increases and density decreases B. volume decreases and density increases C. volume increases and density increases D. volume decreases and density decreases

C.

Volume increases while density decreases, ever so slightly...

As water freezes its volume will expand and break a sealed copper pipe full of water. Because water is undergoing a phase change into ice/crystalline molecular state.

Experiment with a cylinder of equal percentages water and cooking oil. Lighter/less dense oil will float on top of the water. Put colored ice cubes in and they float but as the ice melts, water droplets form and sink down to join the higher density water already on the bottom.

Density of ice or 0 deg C is approximately .99989 grams/cubic centimeter.
Water at 4 deg C is .99995 gm/cm cubed

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].

Answer (d) the greenhouse effect is primarily caused by car and trucks;