what is the first and fourth planet in the solar system?
Is that not in your text? Here is a site that will give you the information.
http://nineplanets.org/
1st is Mercury
The first planet in the solar system is Mercury, and the fourth planet is Mars.
To find the order of the planets in the solar system, you can use a mnemonic device such as "My Very Educated Mother Just Served Us Noodles." Each word in this phrase represents the first letter of each planet in order, starting from the sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
Alternatively, you can also remember that the inner terrestrial planets (closest to the sun) are Mercury, Venus, Earth, and Mars, in that order.