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I want to   learn 

about the rock 

cycle... HMMM 

where should I 

start?....

Timmy, ask me, Rocky 

the Rock, for some 

help. I know 

everything there is to 

know about the rock 

cycle, because I'm a 

rock.

Alright, Rocky.  

What stage of the 

rock cycle are you 

at right now? 

Well, Timmy, right now I am an 

igneous rock. One day awhile ago, 

that volcano over there just erupted 

and spewed out hot magma in an 

avalanche of lava!   I formed when the 

lava cooled. Magma is the hot liquid 

under the volcano, and lava is what 

it's called when it reaches the surface. 

Pretty cool right? 

Well, from here one of three things could happen.  

First, I could melt and turn back into lava. 

Second, with weathering and erosion, I could turn 

into sediment. Third, with the combination of heat 

and high pressure, I could turn into metamorphic 

rock. 

Hold up there 

Rocky the 

Rock. What's 

weathering 

and erosion?

Oh, sorry there, Timmy. I forgot for 

a second that you're new to the 

rock cycle. Weathering is the 

breaking down of rocks, and 

erosion is the transportation and 

wearing away of rocks. Here I'll 

show you.... See look at me now! 

I'm sediment. I have been 

weathered and can be moved by 

water or wind erosion.   Any kind of 

rock, including metamorphic and 

sedimentary can do this.

Oh, I did not explain sedimentary rocks, yet, either. It will 

be better to show you.... Get ready. Look at me now. 

With sediment compacting and cementing together, it can 

turn into sedimentary rock. Sediment can be carried by 

ice erosion or by wind erosion and be deposited into the 

ocean from rivers and streams.   The mountain where my 

volcano resides has a snowy, cold climate in the winter 

season.   Ice erosion happens when the snow melts or 

gravity pulls me down the mountainside, kind of like 

sledding!

Once in the ocean, the sediment can stack up and 

compact, like I am now.   From here, besides weathering 

back into sediment, the only thing I can do is undergo 

high pressure and heat to turn into metamorphic rock.  

My brother Sandy the Grain lives in the Mojave 

Desert, a place with a dry, hot climate.   He gets 

carried around by wind erosion.   He doesn't much 

care for being banged and scraped against rocks, but 

the sand dunes are very pretty.   He hopes someday 

to get transported by the wind and rain to Utah so 

that he can help create an arch, but that seems like a 

long way to travel to me.

My other brother, Lime the Stone, is a 

sedimentary rock, who lives in California Cavern 

in the Sierra Nevada Mountains.   When the 

rainwater is absorbed into the ground there, the 

acid it gathers from the air and soil erodes him 

and his friends into beautiful crystals, called 

stalactites and stalagmites.

Back to the rock life cycle....As I was saying, 

with the compacting and cementing that 

happened in the ocean, I am a sedimentary 

rock, like I am now, I can turn into a 

metamorphic rock with pressure and heat.

As a metamorphic rock, I am ready to be buried.  

Other layers of metamorphic rock will land on top of 

me over time. Then, I can melt back into magma, 

and, finally, crystallize back to igneous rock!

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