Explanation

The Himalayas were formed by the collision of the Indian and Eurasian tectonic plates.

They are the highest and most prominent fold mountains in Asia, including Mount Everest.

Explanation

The pyramids, especially the famous ones at Giza, were built by the ancient Egyptians as tombs for their pharaohs.

They are architectural wonders that reflect the engineering skills and religious beliefs of ancient Egypt.

Explanation

"Talked" is the verb in the sentence because:

It is the action word (what they did).

It functions as the past tense of "talk."

Explanation

Arteries are blood vessels that carry oxygen-rich blood away from the heart to the body.

They have thick, muscular walls to handle the high pressure of blood pumped by the heart.

Explanation

O(P) = O(Q) means the number of elements in P is equal to the number of elements in Q.

This implies that P and Q have the same cardinality, which can be represented as P ~ Q (P is equivalent to Q).

Explanation

Let's multiply the fractions:

(9/4) × (-4/9) × 2/3

= (9 × -4 × 2) / (4 × 9 × 3)

= -72 / 108

= -2/3

Explanation

The charges of Proton, Electron, Neutron respectively are:

• Proton: Positive charge (+1)
• Electron: Negative charge (-1)
• Neutron: Neutral charge (0)

Explanation

Let's find the square numbers between 63 and 143:

8² = 64 (since 8² = 64 > 63)

9² = 81

10² = 100

11² = 121

The next square number would be 12² = 144, which is greater than 143, so we stop at 11².

Now, let's calculate the sum:

64 + 81 + 100 + 121 = 366

Explanation

"Shaked" is incorrect; the past tense of "shake" is "shook."

Corrected sentence: "Houses shook like leaves when the earthquake hit the region."

Explanation

Chemical equilibrium occurs when the forward and reverse reactions occur at the same rate.

At this point, the concentrations of reactants and products remain constant, not necessarily equal.