I think you mean "oil". I think that was an idea about Venus.
The Polar ice caps , its red colour and the dark lines that were once thought to be canals. see realted link for picture
Pluto.
There are eight known planets. Pluto was once considered a planet, but it is no longer officially considered a planet.There are eight known planets. Pluto was once considered a planet, but it is no longer officially considered a planet.There are eight known planets. Pluto was once considered a planet, but it is no longer officially considered a planet.There are eight known planets. Pluto was once considered a planet, but it is no longer officially considered a planet.
From 1930 (when Pluto was discovered) to 1978, Pluto was the most distant planet. In 1978, Pluto slipped inside Neptune's orbit. Neptune was the farthest planet from 1978 to 1999, and Pluto (which has a fairly high eccentricity) was farther away from 1999 to 2006. In 2006, the International Astronomical Union "demoted" Pluto from Planet to Dwarf Planet, meaning that Neptune is once again the most distant planet.
Planet Biyo is considered a planet because it meets the criteria set by the International Astronomical Union for planetary classification. It orbits the sun, has enough mass to be round due to gravity, and has cleared its orbit of other debris.
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