Mars is known as the red planet. This is because the iron in the soil gives it a red color. Mars is thought to have once had lakes and oceans.
There seems to be no direct evidence that any planet was thought to be covered in oil. Some sources seem to point to Venus but there is no reason that Venus would have oil apart from the early belief that because Venus was covered with clouds, clouds meant rain. Which meant that the surface of Venus had water. because of it's proximity to the Sun, it must be warm. So what has a lot of water and is warm. Swamps. What did swamps have, a lot of trees. Aka the carboniferous period when vast quantities of carbon was laid down which would have produced quantities of oil, gas and coal - as on Earth. However, this did not happen. Please add to the discussion area with reasons, why this question was asked to assist in getting a better answer.
There are no seas on Mars. While Mars once had oceans and lakes in its distant past, they have dried up due to the planet's thin atmosphere. Today, Mars has no bodies of liquid water on its surface.
The Rover mission confirmed that Mars once had liquid water on its surface.
Pluto was once considered the ninth planet in our solar system, but it was reclassified as a dwarf planet in 2006 by the International Astronomical Union.
I think you mean "oil". I think that was an idea about Venus.
Venus
The rocks were similar to rocks formed by volcanoes on Earth, suggesting that vast oceans of molten lava once covered the moon's surface.
Mars is known as the red planet. This is because the iron in the soil gives it a red color. Mars is thought to have once had lakes and oceans.
groundwater interacts with salt deposits that are the remnants of ancient oceans that once covered Michigan
No more then the Great American Desert of Kansas, Nebraska, the Dakotas, Colorado and Wyoming were once thought to be.
The rocks were similar to rocks formed by volcanoes on Earth, suggesting that vast oceans of molten lava once covered the moon's surface.
sodium is found in salt deposits found under oceans or where oceans once where.
There seems to be no direct evidence that any planet was thought to be covered in oil. Some sources seem to point to Venus but there is no reason that Venus would have oil apart from the early belief that because Venus was covered with clouds, clouds meant rain. Which meant that the surface of Venus had water. because of it's proximity to the Sun, it must be warm. So what has a lot of water and is warm. Swamps. What did swamps have, a lot of trees. Aka the carboniferous period when vast quantities of carbon was laid down which would have produced quantities of oil, gas and coal - as on Earth. However, this did not happen. Please add to the discussion area with reasons, why this question was asked to assist in getting a better answer.
Once Upon a Planet was created on 1973-11-03.
no, but it was once called a planet before
The Polar ice caps , its red colour and the dark lines that were once thought to be canals. see realted link for picture