Mass, Volume And Weight

Explanation
The correct answer is "Total amount of matter in an object." Mass refers to the total amount of matter present in an object, regardless of its volume or shape. It is a fundamental property of matter and is measured in units such as kilograms or pounds.

Explanation
The explanation for the correct answer "True" is that weight changes are a natural occurrence in life. People's weight can fluctuate due to various factors such as diet, exercise, hormonal changes, and overall health. It is common for individuals to experience weight gain or loss over time. Therefore, it can be concluded that weight changes are indeed true.

Explanation
Mass is a measure of the amount of matter in an object, and it remains constant regardless of the location or gravitational force acting on it. Gravity, on the other hand, is a force that attracts objects towards each other and can vary depending on the mass of the objects and the distance between them. Weight, however, refers to the force of gravity acting on an object and can change depending on the strength of the gravitational field. Earth is the specific planet in this context, where the gravitational force is responsible for weight variations.

Explanation
The correct answer is "Total amount of space matter takes up." Volume refers to the measure of the amount of space occupied by an object or substance. It is a physical property that is used to quantify the three-dimensional space that an object occupies. The volume of an object can be calculated by measuring its dimensions such as length, width, and height, or by using displacement methods. In this context, the other options - total matter in an object and density - do not accurately define volume.

Explanation
Weight is the measure of the force of gravity acting on an object. It is the result of the gravitational attraction between the object and the Earth. The force of gravity pulls objects towards the center of the Earth, causing them to have weight. Therefore, the correct answer is "Force of gravity pulling to the center of Earth."