<< Chapter < Page | Chapter >> Page > |
Igneous rock
1. cracks in the earth's crust
Key
2. earth's crust
3. lava cools and solidifies as grey / black basalt
4. red molten lava
5. crater of the volcano
6. magma forms lava
Assignment 5:
1. Magma (lava) will cool quickly as soon as it has erupted from the volcano and runs down the mountain slope
Reason: Little lava, exposed to the "cooler" atmosphere.
2. Granite is found deep underneath the crust
Reason: Magma has to cool slowly in order to form granite.
3. Deep underneath the earth's crust.
4. Deep underneath the earth's crust.
Reason: The surrounding rocks keep the magma hot for a very long time. Therefore, it cannot cool quickly.
5. Basalt is found on the slopes of the volcano.
Reason: Basalt forms when lava cools quickly. It has to be outside the crust.
6. The smallest crystals appear in basalt - thus on the mountain slopes and valleys near the volcano.
WE ARE GOING TO STUDY THE DIFFERENT TYPES OF ROCK FORMATION
THAT FORM THE CRUST OF THE EARTH BECAUSE SEEDS DO NOT GROW EQUALLY WELL IN ALL KINDS OF SOIL.
KEY
1. ___________________________________________________________________
2. ___________________________________________________________________
3. ___________________________________________________________________
4. ___________________________________________________________________
5. ___________________________________________________________________
6. ___________________________________________________________________
We can work out how igneous rocks were formed by noting what happens to lava when there is a volcanic eruption. Lava cools down when it runs down the mountain slopes and begins to harden.
ASSIGNMENT 5
Study the following diagram and answer the questions:
1. Where will the magma be able to cool down the soonest? Why?
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
(2)
2. Where do we find granite? Explain why.
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
(2)
3. Where will the largest crystals be found when the magma starts to harden?
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
(1)
4. Where will the magma cool down the slowest? Why?
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
(2)
5. Where will we find basalt? Explain why.
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
(2)
6. Where will the smallest crystals be found?
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
(1)
Summative: 10
Learning Outcome 2: The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.
Assessment Standard 2.1: We know this when the learner recalls meaningful information.
Notification Switch
Would you like to follow the 'Natural sciences grade 6' conversation and receive update notifications?