(a) State four characteristics of igneous rocks. .
(b) The table below illustrates the combined demand and supply schedule for maize.
Use it to answer the questions that follow.
|
Price (₦) |
Quantity of maize demanded(kg) |
Quantity of maize supplied (kg) |
|
20 |
50 |
340 |
|
16 |
70 |
300 |
|
12 |
125 |
250 |
|
8 |
200 |
200 |
|
4 |
350 |
130 |
(i) Draw the demand and supply curves to show the equilibrium price of maize.
(ii) Determine the excess demand for maize at a unit price of ₦4.
(iii) Determine the excess supply for maize at a unit price of ₦12.
Explanation
(a) Charateristics of igneous rocks
- Formed from molten magma/volcanic eruption;
- Crystalline in nature;
- Resistant to weathering and erosion;
- Contains mainly primary minerals;
- Coarse or fine grained particles which is visible;
- Light or dark coloured;
- They are very hard.
(b) (i) Demand and supply curves for maize