A student is asked to calculate the density of a small rock. An electronic scale measures the mass of the rock as 12.1 grams. The student puts the rock in a large
graduated cylinder that is partially filled with water. The water level in the
graduated cylinder before the rock is added is 24.2 ml, and after the rock is added,
the level rises to 28.8 mL. What is the density of the rock, stated in grams per cubic
centimeter?

Iknow the answer is a but i don't know why

Analyze how limestone is weathered and identify the features that are formed as a result of this dissolution

Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet