Ques:Answer the following question given this paragraph: The weathering of rocks and minerals can be mechanical or chemical. Mechanical weathering changes the size of a mineral or rock. Mechanical weathering does not change the chemical composition of that material. Chemical weathering changes the composition of a mineral or rock. Different types of weathering can alter the same material. Soil forms on top of rock. The type of soil that forms depends on the environment of the region. For example, warm and wet climates form different soils than cold and dry climates. A profile through the soil shows different horizons. Topsoil is the most important layer for crops. Water, ice, wind, and gravity create or modify landforms on Earth's surface. These agents can erode or deposit features that indicate their presence. Erosion by water and ice lowered and rounded the Appalachians. These old mountains no longer look like the Himalaya. Someday the Himalaya may look like the Appalachians do now. Q: What kind of weathering changes the size of a mineral or rock but does not change its chemical composition? Choices: - molecular weathering - chemical reaction - radiation - mechanical weathering A:

Ans:mechanical weathering
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Ques:Answer the following question given this paragraph: There are three types of mechanical waves. They differ in how they travel through a medium. The three types are transverse, longitudinal, and surface waves. All three types are described in detail below. Q: How many types of mechanical waves are there? Choices: - five - nine - one - three A:

Ans:three
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Ques:Answer the following question given this paragraph: The theory of climate change is very new. In fact, scientists don't even call it a theory. But it meets the requirements. These are the things we know: (1) average global temperatures are rising, (2) greenhouse gases trap heat in the atmosphere, (3) CO 2 is released into the atmosphere when fossil fuels are burned, (4) CO 2 is a greenhouse gas, (5) more CO 2 in the atmosphere traps more heat so global temperature is rising. No information contradicts this theory, although some details have not been worked out. The theory is very effective at predicting future events, which are already taking place. This idea will be explored in detail in the chapter Atmospheric Processes . Q: Which theory helps predict future events in weather? Choices: - expected change theory - future weather theory - carbon change theory - climate change theory A:

Ans:climate change theory
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Ques:Answer the following question given this paragraph: Q: What tissue system has neither dermal nor vascular tissues? Choices: - external tissue system - work tissue system - internal tissue system - ground tissue system A:

Ans:
ground tissue system
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