What do the planets Earth and Mars have in common?

They are both terrestrial planets which means that both are differentiated between a dense metallic core and an overlying mantle and crust composed of less dense materials. Like Earth, Mars also has seasons, weathers, polar ice caps, volcanoes, and canyons. It's atmosphereare also has carbon dioxide and nitrogen.

They are both planets, they both have an atmosphere, they both have already been discoverd, and they both have almost the same amount of dry land.

depends on the age of the teen, many believe by the age of 16 a person should know the strong difference between right and wrong along with the difference between risky and immediate death. swimming with sharks might be dangerous but swimming with sharks while bloody meat is attached to you is just insane. even more if you have no idea what you're doing. however, no matter the age, as long as the person is skilled enough and has the mental and physical capacity to control their actions doing whatever sport they put their mind to is all that matters.

islam spread slowly through much of africa through trade and preaching.