When you begin an experiment, why should you create a table to record your data?

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

The activity of the modern sample is 1.10 bq . how long does that measurement take?

Which number represents a basic ph, 4 or 9? numerical answers expected! answer for blank 1: i'll give