Rocks Rock!
What is a rock?
A rock is a hard nonliving object from the ground.
Minerals
How does Igneous rock form?
Magma or lava cools and hardens.
What parts are in soil?
Compare a pebble to a boulder.
A pebble is a very small rock and a boulder is a very large rock.
What are the three main types of rocks?
Igneous, Sedimentary, and metamorphic.
What are sediments?
Small pieces of rock.
Why is weathering important in making soil?
Weathering breaks down rocks into bits.
What is sand made of?
Sand is made of many tiny pieces of rock. Many plants cannot grow in it.
Why do rocks look different and have different textures?
They have different minerals and are made in different ways.
This type of rock may contain pieces remains of plants and animals such as shells, skeletons, or imprints.
Sedimentary rock
What do you know about humus?
It is made of once-living things. It holds water well. It is good for growing many kinds of plants.
What forces break down rocks through weathering?
Wind & water
Name three ways you could group rocks.
size, color, shape, texture, weight, or hardness.
This rock is formed deep inside the earth. It is formed when heat and pressure from rocks above cause the minerals to change.
Metamorphic rock
What do you know about clay?
It is sticky when it is wet and smooth when it is dry. Many plants do not grow well in it.
How might a boulder turn into a pebble?
Through weathering; weathering turns big rocks into smaller rocks.
What is a mineral?
Made by nature, and is inorganic.
Why are rocks a popular building material in homes and offices?
Rock is hard and strong; it is easy to find; it lasts a long time.
You know that plants need water and things from the soil in order to grow. Which type of soil would be best for growing plants?
A soil with a lot of humus because it holds water well.