Do You Have Basic Knowledge About 3rd Grade Social Studies?

Explanation
A car is not a natural resource because it is a man-made product that is created using various natural resources such as metals, plastics, and rubber. Natural resources are materials that occur naturally in the environment and are not created by human intervention. Gold, rock, and limestone are all examples of natural resources as they are found in nature without any human involvement in their creation.

Explanation
Soil is the correct answer because it is a physical phenomenon that does not lack boundaries. Unlike air, water, and energy, which can freely flow and move without clear boundaries, soil is a solid material that is confined within a specific area or region. It has distinct boundaries that separate it from other substances or environments.

Explanation
A mud hut is not an urban setting because it is typically found in rural areas or villages, rather than in cities or urbanized areas. Urban settings are characterized by the presence of buildings, infrastructure, and a higher population density, whereas a mud hut is a traditional dwelling made of natural materials and is more commonly associated with rural or remote areas. Therefore, the mud hut does not fit the definition of an urban setting.

Explanation
The correct answer is "Habitat" because it refers to the natural environment or surroundings in which a particular species or organism lives. It includes the physical factors such as climate, soil, and vegetation, as well as the interactions with other living organisms.

Explanation
A spur is not a water body. It is a landform that is a small ridge or hill that branches off from a larger mountain or hill. Lakes, rivers, and oceans are all examples of water bodies.

Explanation
The atmosphere is not a factor affecting an environment because it is an integral part of the environment itself. The atmosphere consists of gases, such as oxygen and carbon dioxide, which play a crucial role in supporting life and regulating climate. Temperature, rainfall, and humidity, on the other hand, directly influence the conditions and characteristics of an environment. They can determine the types of organisms that can thrive in a particular area and impact the overall ecosystem dynamics.

Explanation
The invention of the car was made as a result of civilized urban actions. The development of cities and the need for efficient transportation in urban areas led to the creation of the car. As cities grew and populations increased, there was a demand for a mode of transportation that could easily navigate through busy streets and transport people and goods quickly. The invention of the car revolutionized urban mobility and paved the way for modern transportation systems in cities around the world.

Explanation
The smallest unit of an environment refers to the basic building block or primary social group that an individual belongs to. The family is considered as the smallest unit of an environment as it provides the first and most immediate socialization for an individual. It is within the family that individuals learn values, norms, and behaviors that shape their interactions with others and their understanding of the world. The family also plays a significant role in the development of an individual's identity, social skills, and emotional well-being.

Explanation
The Earth has four spheres: the lithosphere (solid outer layer), the hydrosphere (all water on Earth), the atmosphere (layer of gases surrounding Earth), and the biosphere (all living organisms on Earth). Each sphere interacts with and influences the others, creating a complex and interconnected system.

Explanation
An ecological unit refers to a specific area or habitat where living organisms interact with each other and their environment. It includes various components such as plants, animals, microorganisms, and abiotic factors like rocks. However, rivers are not typically considered as a part of an ecological unit, as they are considered more of a connecting feature or boundary between different ecological units rather than an integral component of one specific unit.