Question

1. the processes that change objects on earths surface over time are called_________.

a. erosion
b. ice wedging
c. oxidation
d. weathering

1. a soils composition is dependent on weathering because _________.

a. it makes the soil more fertile
b. it contributes sediment to the soil
c. it keeps the soil moist
d. it moves the topsoil to other areas where it is needed more

1. all of the following except _________ can weather rock.

a. sunlight
b. freezing and thawing
c. animals
d. plants

1. how do chemical and mechanical weathering differ?

a. mechanical weathering occurs when rocks are broken by physical processes, and chemical weathering happens
b. chemical weathering can happen with the help of animals, mechanical weathering cannot
c. chemical weathering can occur with the help of water reacting with carbon dioxide, and water has nothing to do with mechanical weathering
d. plant roots can help mechanical weathering occur, but have no impact on soil when it comes to chemical weathering

Explanation:

1. For question 3: Weathering is the process that changes objects on Earth's surface over time. Erosion is the movement of weathered material, ice - wedging is a type of mechanical weathering, and oxidation is a chemical process related to weathering but not the overall term for surface - changing processes.
2. For question 4: Weathering breaks down rocks and minerals, contributing sediment to the soil, which affects soil composition. It doesn't directly make soil more fertile (though it can be a part of the long - term process), doesn't keep soil moist, and doesn't move topsoil to other areas.
3. For question 5: Freezing and thawing, animals, and plants can all contribute to weathering rocks. Sunlight doesn't directly weather rocks in the same mechanical or chemical ways these other factors do.
4. For question 6: Mechanical weathering breaks rocks by physical processes like abrasion, while chemical weathering involves chemical reactions such as water reacting with carbon dioxide to form carbonic acid which can dissolve rocks. Animals can contribute to mechanical weathering, water is involved in chemical weathering, and plant roots can contribute to both mechanical and chemical weathering in some cases.

Answer:

1. D. weathering
2. B. it contributes sediment to the soil
3. A. sunlight
4. A. Mechanical weathering occurs when rocks are broken by physical processes, and chemical weathering happens through chemical reactions.