An asteroidâs composition is mainly determined by how close it is to the Sun. The asteroids that are nearest the Sun are mostly made of carbon, with smaller amounts of nitrogen, hydrogen and oxygen, while the ones further away are made up of silicate rock.Silicates are very common on Earth and in the Solar System.ut other materials have been found in asteroids, as well. Overview. Asteroids are solid, rocky and irregular bodies that are the rocky remnants of the protoplanetary disk of dust and gas that formed around our young Sun over 4.5 billion years ago.
Judgmental sampling is a non-probability sampling technique where the researcher selects units to be sampled based on their knowledge and professional judgment. Don't miss these related articles:
Definitions. A sample is the group of people who take part in the investigation. The people who take part are referred to as âparticipantsâ. Sampling is the process of selecting participants from the population. The target population is the total group of individuals from which the sample might be drawn.Generalisability refers to the extent to which we can apply the findings of our research to the target population we are interested in.. Systematic Sampling Chooses subjects in a systematic (i.e. orderly / logical) way from the target population, like every nth participant on a list of names. To take a systematic sample, you list all the members of the population, and then decided upon a sample you would like.