We wanted to make a video about sedentary rocks, but we couldn't get lazy uncle Rocky off the couch. Oh well. We'll teach you about sedimentary rocks instead.
|Elementary and Middle School||3rd Grade|
with one, now can you? [Girl chucking a stick for a fish to fetch]
But never fear. We have found the perfect pet for you… one that's
often overlooked, but pretty much perfect… [Tortoise walking around]
The pet rock.
They're obedient, trust-worthy, and you can take them anywhere. They don't make a mess
and you don't even need to feed them. What's not to love? [Bowl of cereal next to the pet rock]
Best of all, rock can be found everywhere!
In fact, one specific kind of rock covers 75% of the Earth's land surface – sedimentary rock.
And no, that's not a type of relaxing soft rock music you might hear in a new age spa. [People relaxing in a spa]
Sedimentary rock is rock formed by “sediment” - that is, the remains of rock getting moved [Coop pointing at a blackboard]
from one place to another before settling and eventually combining with other sediments [Dino pointing at a blackboard]
to form a new rock.
Sedimentary rock includes the most common rock types you'll find on Earth, like chalk,
limestone, sandstone, clay and shale. And as we all know, we humans are a resourceful
bunch – if there's a whole lot of something just sitting around, well, we're not just [Wheelbarrow full of clay]
gonna let it sit around doing nothing for much longer. We're going to put it to use! [Someone modelling clay]
And throughout history, humans have put sedimentary rock to good use.
One of the most famous examples of humans using rocks is when the ancient Egyptians [Picture of the pyramids]
used limestone to build the pyramids over 4,000 years ago.
Huge bricks of stone were carved from quarries of limestone before being pulled by thousands
and thousands of slaves and stacked on top of one another to form the pyramids.
It's thought that building the pyramids took approximately twenty years, and they remain
one of the great wonders of the ancient world. [Tourist taking a picture of the pyramids]
Plus, they're nice little toys for that giant cat to bat around.
Other famous examples of structures built using sedimentary rock include... [Picture of the Sphinx]
Machu Picchu, which was built in the 15th century in Peru and has nothing to do with Pokémon… [Picture of Pikachu appears]
The Great Wall of China, completed in the 14th century in, you guessed it, China...
Big Ben, built in 1859 in London...
And the White House, finished in 1800 in Washington, D.C..
These are just a few examples of the many amazing structures we've built using the Earth's [Examples of sedimentary rocks]
sedimentary rock – making it the world's most important rock. [A 'most important rock' medal is stuck to one of the rocks]
Well…except for rock and roll. Sorry, sedimentary rock. Rock and roll is always king. [Elvis dancing]