The correct answer is: D. Mercury, Venus, Earth, Mars
The inner planets are the four planets closest to the Sun in the Solar System. They are Mercury, Venus, Earth, and Mars. They are also called terrestrial planets because they have a compact, rocky surface like Earth’s terra firma.
Mercury is the smallest planet in the Solar System and the closest to the Sun. It is a rocky planet with a solid surface. Mercury has no atmosphere, so it is very hot during the day and very cold at night.
Venus is the second planet from the Sun and the hottest planet in the Solar System. It is a rocky planet with a thick atmosphere of carbon dioxide. Venus has no liquid water on its surface, and its surface is covered in volcanoes and craters.
Earth is the third planet from the Sun and the only planet in the Solar System known to support life. It is a rocky planet with a moderate atmosphere of nitrogen and oxygen. Earth has liquid water on its surface, and its surface is covered in land, oceans, and ice.
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System. It is a rocky planet with a thin atmosphere of carbon dioxide. Mars has no liquid water on its surface, and its surface is covered in volcanoes, craters, and canyons.