Explanation: Radioactive elements decay at a certain constant rate and this is the basis of radiometric dating. Sedimentary rocks may have radioactive elements in them, but they have been re-worked from other rocks, so essentially, there radiometric clock has not been re-set back to zero.

Are sedimentary rocks hard to break?

Generally, sedimentary rock is fairly soft and may break apart or crumble easily. You can often see sand, pebbles, or stones in the rock, and it is usually the only type that contains fossils. Examples of this rock type include conglomerate and limestone.

What is the hardest rock to break?

Sometimes when people ask what the strongest rock is, they are really wondering what the hardest rock is. In geology, hardness is how resistant a mineral is to scratching. Hardness is measured using Mohs Hardness Scale .Hardest Rocks.MineralHardnessTalc1Gypsum2Calcite3Fluorite46 more rows

What can you often see in sedimentary rock?

Sedimentary rocks often have distinctive layering or bedding. Many of the picturesque views of the desert southwest show mesas and arches made of layered sedimentary rock. Common Sedimentary Rocks: Common sedimentary rocks include sandstone, limestone, and shale.