What does it mean when a mineral has a definite chemical composition? select 2 choices.
it always occurs in pure gorm.
it always contains certain elements.
it cannot form from living or once living materials.
it always contains elements in definite proportions.
it cannot contain atoms from more than one element.

The mineral has definite composition when it contains elements in definite proportion and it also cannot be formed from living or once lived materials.

A mineral is said to be of definite chemical composition only if it consists of elements in definite proportion or quantity. The chemical composition of mineral would be same with chemical formula. The atoms occur in specific range in each minerals.

The mineral cannot be formed from a living organism or from an organism that once lived. All minerals occur naturally in nature. Minerals cannot be man-made or manufactured in laboratory.

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.