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Port Said International Schools
Better education for future generations
Science Department
Grade: 7
Worksheet 10
Name: ……………………………………………. Date: ………………..………………………………
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1-Classify the following rocks according to their types
The rock
Type
Granite
Basalt
Sandstone
Limestone
Marble
igneous plutonic rock
igneous volcanic rock
Sedimentary
Sedimentary
metamorphic
2 -Write the scientific term:
1. A thin, fragmented and loosened layer consists of a mixture of mineral salts, water, air
and decayed organic substances.
(Soil)
2. The type of rocks which is formed from the molten matter underneath the earth's
crust.
(Igneous)
3. The type of igneous rocks which is formed when magma reaches earth's surface in the
form of a flow of lava.
(Volcanic rocks)
4. The type of rocks which is formed when other rocks are exposed to high pressure&
temperature.
(Metamorphic rocks)
5. The rock which is formed of calcite.
(Limestone)
3-Complete the following sentences:
1. The molten materials underneath the earth surface is called magma while when they
reach the earth surface they form lava
2. Granite are examples of igneous rocks.
3. Granite consists of three main minerals which are feldspar , quartz and mica
4. Basalt consists of feldspar, pyroxene and olivine
5. The sedimentary rocks are formed as a result of the process of fragmentation and
disintegration of the igneous, sedimentary or metamorphic rocks that are previously
existed the deposition
6. Lime stone reacts with hydrochloric acid producing carbon dioxide
4-Compare between:
A)
Points
Granite
Basalt
Type
Plutonic
volcanic
Color
Pink or grey
dark
Minerals forming
each one
feldspar , quartz and mica
feldspar, pyroxene and olivine
B)
Points
Sandstone
Limestone
Color
yellow
White
Texture
Coarse
Smooth
Structure
Sand grains and quartz
calcite
5- Give reasons for each of the following:
1- The crystals of minerals that form plutonic rocks are large sized.
Because it cools slowly underneath the earth’s crust and it takes a long time to crystalize
2- Volcanic rocks contain small circular holes.
Due to the extruding the of gases from volcanic flows during their cooling and formation
of rocks
3- The components of basalt rock cannot be seen by naked eye.
Because they are very small in sized and their crystals are very small
4- Effervescence takes place when hydrochloric acid is added to a sample of limestone.
Due to the evolving of carbon dioxide gas