Hey kiddo, do you remember what a volcano is? It's kinda like a big mountain that sometimes spits out hot rocks, ash and gases from underground. Well, on Venus there are volcanoes too!
But, on Venus the volcanoes are quite different from the ones we usually see on Earth. For starters, Venus has more volcanoes than Earth does! And they are really huge, like thousands of times bigger than the ones on Earth.
The main reason for this difference is that Venus doesn't have a plate tectonic system like Earth. Plate tectonics is like the moving pieces of a puzzle, that can sometimes rub against each other or pull apart, causing earthquakes and volcanoes. But on Venus, the surface doesn't move like this, so the same volcano can erupt from the same spot again and again and again, making it grow and grow.
Another way Venusian volcanoes are different is that they spew out very hot lava that flows a really long way without solidifying. This is because Venus' atmosphere is very thick and hot, keeping the lava hot even when it is outside the volcano.
Scientists have also found that Venus' volcanoes produce different kinds of rocks that are not seen on Earth. They think this is because the rocks on Venus are made from different materials and melted at different temperatures than the ones on Earth.
So in summary, Venus has lots of really big volcanoes that erupt from the same spot again and again because the planet doesn't have plate tectonics like Earth does. The lava from these volcanoes flows a really long way because Venus' atmosphere is different than Earth's, and the volcanoes produce different kinds of rocks than Earth does.