Explanation

(a) Sedimentary rocks are rocks formed from accumulation of sediments or particles of rock over long periods usually by water, wind or ice, or derived from the remains of plants and animals or chemical reaction. The sediments are accumulated in layers hence, they are called statified or layered rocks.

(b) The three classes of sedimentary rocks according to their mode of formation:

- Mechanically formed sedimentary rocks

- Organically formed sedimentary rocks

- Chemically formed sedimentary rocks

(c) (i) Mechanically formed sedimentary rocks;

(1) Accumulation of materials derived from other rocks

(2) Cemented together over a long period

(3) Agents of erosion such as wind, water and glaciers are involved.

(4) Examples are sandstone, clay, gravel, shale

(5) Example are found in Lake Chad Basin, Sotoko Basin, Niger-Benue trough.

(ii) Organically formed sedimentary rocks;

(1) Formed from remains of dead plants and animals

(2) When formed from dead animals, they are known as calcareous rocks e.g. limestone, chalk.

(3) When formed from dead plants, they are known as carbonaceous rocks.

(4) Examples include limestone, chalk, peat, lignite or coal

(iii) Chemically formed sedimentary rocks;

(1) Formed from solutions of one kind or another

(2)Chemically precipitated from other rocks before solidification.

(3) Gypsum is precipitated from salt lakes

(4) Examples include rock salt, potash, gypsum, nitrates.

(d) Importance

(1) Source of materials for construction

(2) Source of minerals e.g. petroleum, coal, gold

(3) Determines the availability and supply of underground water

(4) Rocks provide tourists attractions e.g. Ogbunike cave.

(5) Source of raw materials e.g. limestones for cement

(6) Source of food e.g. rock salt

(7) Used as medicine e.g. kaolin

(8) Used for scientific research e.g. fossils.

Correct Answer: A. Dependable

Explanation

reliable; consistently good in quality or performance; able to be trusted.

Dependable; trustworthy and reliable.

Correct Answer: A. Usury

Correct Answer: D. Pentylethanoate

Correct Answer: C) 4 .5 x 10^-12 s

Correct Answer: C) bills of exchange and promissory notes

Explanation

Promissory notes, on the other hand, are written promises to pay a specified amount of money at a future date. They are often used in lending situations, such as when someone borrows money from a bank.

Both bills of exchange and promissory notes are considered instruments of credit because they represent a promise to pay a certain amount of money in the future. These documents can be used as collateral or proof of creditworthiness when borrowing money or obtaining goods on credit.

Therefore, the correct answer to the question is Option C: Bills of exchange and promissory notes.

Correct Answer: D) Pecking

Explanation

Pecking is a form of feeding for birds not movement

Explanation

(a) 21 - (3 x 0) = 21 - 0 = 21

21 - (3 x 1) = 21 - 3 = 18

21 - (3 x 3) = 21 - 9 = 12

21 - (3 x 4) = 21 - 12 = 9

21 - (3 x 5) = 21 - 15 = 6

21 - (3 x 6) = 21 - 18 = 3

(b)

(c) (i) Price of the commodity.

(ii) Income of consumers.

(iii) Price of other commodities

(iv) Taxation

(v) Population

(vi) Tastes and fashion

(vii) Weather

(viii) Expectation of future rise in prices

(ix) Government policy

(x) Advertisement.

Correct Answer: C. 200.0Hz

Explanation

\(\lambda\) = 4L = 4 X 45 = 180cm

F = \(\frac {V}{\lambda}\)

= \(\frac {360}{180 \times 10^{-2}}\)

= 200Hz

Correct Answer: B.. x=5,y=9

Explanation

The set is already in increasing order. We have six numbers in the set and we need to ensure the set will have a median of 6. When there is an even number in the set, we need to take the two middle numbers by adding them then dividing by two. The two middle numbers represent x and 7. Let's set up an equation. x+7/2=6. The numerator represents the two middle numbers being added and divided by the denominator. If we multiply both sides by 2, and subtract 7 on both sides, we get x to be 5. Finally, to find y, we need a number that is greater than or equal to 9 and less than or equal to 10. Answer x=5, y=9 satisfies all conditions.