The Solar System MS-ESS1-3
NGSS

The average distance between Earth and the Sun, about 150 million km, or 93 million miles
Astronomical unit
The average distance between Earth and the Sun, about 150 million km, or 93 million miles, is called an astronomical unit. An astronomical unit is a way to measure distances in space using the average distance from Earth to the Sun.

One of the four rocky planets of the inner solar system, Mercury, Venus, Earth or Mars
Terrestrial planet
One of the four rocky planets of the inner solar system, Mercury, Venus, Earth, or Mars, is a terrestrial planet. A terrestrial planet is a planet that is made mostly of rock and metal and has a solid surface.