Here's why:
* Sedimentary rocks are formed from the accumulation and cementation of sediments, which are fragments of other rocks, minerals, or organic matter. These sediments are transported by wind, water, or ice and deposited in layers. Over time, the weight of overlying layers compresses and cements the sediments together, forming rock.
* Lava is molten rock that erupts from volcanoes. When lava cools and solidifies, it forms igneous rocks, which are very different from sedimentary rocks in their formation and composition.
Here's a simple way to remember the difference:
* Igneous rocks: Formed from fire (lava)
* Sedimentary rocks: Formed from sediments
Let me know if you have any other questions!