25% of 100 equals 25 because 'percent' means per hundred. This basic calculation is essential for understanding ratios and further mathematical concepts.

Earth is the planet on which we live and is commonly known as the Blue Planet because of its vast oceans. Recognizing our home planet is a fundamental piece of general knowledge.

At room temperature, water exists in a liquid state because its molecules move freely without vaporizing. This concept is fundamental to understanding the states of matter.

A declarative sentence makes a statement and is properly ended with a period. This punctuation indicates a complete thought and a full stop.

Multiplying 7 by 8 gives 56, which is a basic multiplication fact. Mastery of these multiplication tables is important for more advanced arithmetic.

The fraction 6/8 simplifies to 3/4 when both the numerator and denominator are divided by 2. Recognizing equivalent fractions is a key skill in arithmetic.

Sublimation is the process in which a solid changes directly into a gas, bypassing the liquid state. This phenomenon is observed in substances like dry ice.

The Great Pyramid of Giza was constructed by the ancient Egyptians as a monumental tomb for a pharaoh. This structure remains one of the most iconic symbols of ancient engineering.

The sentence 'The cat, tired from hunting, slept peacefully.' correctly uses commas to set off the descriptive phrase. Proper punctuation helps clarify which parts of the sentence provide extra information.

Subtracting 3 from both sides gives 2x = 8, and dividing by 2 yields x = 4. This is a straightforward linear equation that reinforces basic algebraic techniques.

Plant roots are primarily responsible for absorbing water and essential nutrients from the soil. Although they also provide physical support, their main function is absorption.

Many textbooks traditionally present the Nile as the longest river in the world. While there is some debate regarding river lengths, the Nile is widely recognized in educational materials.

The word 'quickly' modifies the verb 'ran' and tells us how the action was performed. Adverbs are used to describe the manner, time, or place of an action.

Calculating 3 squared gives 9 and 4 squared gives 16; adding these together results in 25. This problem reinforces the use of exponents and basic addition.

In photosynthesis, plants absorb carbon dioxide and use it along with water and sunlight to produce glucose, releasing oxygen as a by-product. Understanding this process is essential in biology.

By setting up the equation (5/8)x = 25 and multiplying both sides by 8/5, we find that x = 40. This problem tests understanding of proportional reasoning and fraction manipulation.

The water cycle is a continuous process where water evaporates, condenses to form clouds, and then precipitates as rain or snow. This cyclical process is essential for maintaining life and environmental balance on Earth.

A metaphor is a direct comparison between two unlike things without using 'like' or 'as.' This literary device is used to create vivid imagery and enhance understanding.

The Black Death led to a drastic reduction in the population, which in turn created a severe labor shortage. This shortage weakened the feudal system as surviving workers gained more power and mobility.

Let the width be w and the length be 2w; therefore, the perimeter is calculated as 2(w + 2w) = 6w = 36 meters, which gives w = 6. Multiplying the width (6 meters) by the length (12 meters) yields an area of 72 m².