Ribonucleic acid ,or RNA, is one of the three major macromolecules (along with DNA and proteins) that are essential for all known forms of life. Like DNA, RNA is made up of a long chain of components called nucleotides.
The basic building block of any substance is the atom. Every element and compound is made up of one or more atoms. In making up of the atom an atom is made up of only one nucleus but can have several shells. Within the nucleus protons and neutrons are present.Every element has a specific number of protons.toms are tiny units of matter. All matter are made up of matter that occupies space and is made up of atoms. Atoms are the smallest particle of an element that can join up in whole numbers to form molecules.
Structure of the Earth. The Earth is made up of many rocky layers. The solid, outer layer is called the crust. Below the crust lies a layer of very hot, almost solid rock called the mantle. Beneath the mantle lies the core. The outer core is a liquid mix of iron and nickel, but the inner core is solid metal. Sometimes, hot molten rock, called magma, bursts through Earthâs surface in the form of a volcano.