Throughout centuries, mankind used different methods to measure time. List
the methods below historically from oldest to newest.
To measure time
1. People used back and forth motion (ossilation) of pendulums.
2. People used water dripping at a constant rate.
3. People used ossilation of quartz crytals placed in an electric circuit.
4. People used the shadow of a stick as sun travels across the sky.
5. People used atomic clocks using Cesium atoms.

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

falling water hydro = water .. spectcular places these plants are