4.1 Classifying Rocks
When studying rock samples, geologists observe what about the rock
The rock’s mineral composition, color and texture.
Most of Earth’s minerals contain what?
Silica
Sedimentary rocks form over _________ of years
Millions
A coral reef provides what for living things?
food and shelter
What has to be broken before you can use it?
An egg
What does Granite look like? Does it have a high or low silica?
it is a light colored rock that has high silica content.
Name 2 uses from Igneous Rocks
building, tools, granite
Most sedimentary rocks are formed through a series of processes: Name 1 out of 4 of the processes
Erosion
Deposition
Compaction
Cementation
How do Coral Animals Live and eat?
Coral animals use their tentacles to capture and eat microscopic creatures that float by.
I’m tall when I’m young, and I’m short when I’m old. What am I?
A candle
What does Basalt look like? Does it have a high or low silica?
it is a dark colored rock that is low in silica.
How are Intrusive igneous rocks formed?
When magma hardens beneath the Earth’s surface.
When does Erosion occur?
when running water, wind, or ice loosen and carry away fragments of rock.
What does algae need to grow?
Sun light
What month of the year has 28 days?
All of them
What do Geologists observe?
The shape and color of crystals in a rock to identify the minerals that the rock contains.
How are Igneous rocks are classified?
According to their origin, texture, and mineral composition.
When does Deposition occur?
When sediment settles out of the water or wind that is carrying it.
Coral animals cannot grow where?
in cold water, so most coral reefs are found in shallow, tropical oceans.
What is full of holes but still holds water?
A sponge
Rocks are classified into three major groups:Name 2 out of the 3 groups
Igneous, sedimentary, and metamorphic.
How are Extrusive igneous rocks formed?
From lava that erupted onto the Earth’s surface.
There are three major groups of sedimentary rocks: Name 1 of the 3
clastic, organic, and chemical.
eat and pressure deep beneath the Earth’s surface can change any rock into what kind of rock?
metamorphic rock.
What question can you never answer yes to?
Are you asleep yet?