A very common sedimentary rock is called shale， which is a soft rock and was obviously formed by being deposited on the sea bed.
A very common sedimentary rock is called shale， which is a soft rock and was obviously formed by being deposited on the sea bed.
一块极普通的沉积岩叫页岩，这种页岩质地松软，很明显是通过海底沉积作用形成的。