Gravity is not a substance. It is not "made" of anything in that sense. It is an attractive force between objects with mass caused by a distortion of spacetime.
Isaac Newton only composed one law of gravity; you are confusing this with the three laws of motion that Newton also composed. There are lots of questions that can be asked about gravity. I recently answered one on this site, which was, why is it that heavy objects and light objects fall at the same speed?
Gravity results from the interaction of space and matter. As a consequence the Universe, which is composed of matter and space, exhibits gravity everywhere.
Glaciers are not composed of cells; they are composed of H2O molecules. Only living things, such as plants and animals, are composed of cells.
The specific gravity of chert quartz typically ranges from 2.5 to 2.7. This value indicates how dense the material is compared to the density of water. Chert quartz is a common rock composed mostly of silica, and its specific gravity helps in identifying and classifying the rock.
Saturn is a gas giant and is composed of mixture of gases like methan nitrogen etc. The halos, more properly called "rings," are composed of dust and rocks captured by Saturn's gravity.
The Earth's first atmosphere was composed mainly of hydrogen and helium. These gases were eventually lost to space due to the Earth's gravity not being strong enough to hold on to them.
The acceleration of gravity on or near the surface of the moon, and therefore the weight of objects located there, is about 83.5 percent less than on Earth. An object on the surface of the moon weighs about 1/6 of what it weighs on Earth.
The specific gravity of black sand can vary, but it is typically in the range of 2.5 to 3.5. This means that it is 2.5 to 3.5 times heavier than an equal volume of water. Black sand is often composed of minerals like magnetite and hematite, which are dense and contribute to its specific gravity.
A mixture of materials composed of a fluid is called a suspension. In a suspension, the particles of the solid material are dispersed evenly throughout the fluid, but they may settle out over time due to gravity.
Mass is the amount of matter or molecules that a specific object is composed of. Weight is the measure of gravity's pull on you. Does this help answer your question?
It's composed of dust - mainly from its satellites Adrastea and Metis. The dust thrown up from their surfaces is 'captured' by Jupiter's strong gravity.
No mass is not the magnitude of the force due to gravity on an object. Mass is the stuff of which the object is composed. The magnitude of the gravitational forces between the object and Earth ... or whatever planet the object happens to be on ... is the object's "weight".