Why are rocks important?

2 answers:

8 0

Rocks are important because they help scientists understand how global climate change is affecting the planet. Granite and basalt may be the most important types of rocks in the Earth's crust. They are both igneous rocks, which means they form from cooling magma.

Tems11 [23]4 years ago

6 0

Ocks are what make up the earth, and part of what erodes it

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List 3 examples of a selectively permeable material or item. Explain where it is found or used and why a selectively permeable i

FromTheMoon [43]

Answer;
Examples of selectively permeable materials or items are;
1. Vacuum filter- it traps dust but allows air through
2. Coffee filter- allows water to pass through, but does not allow the coffee grounds.
3. Colander -used to strain liquid food from foods. it drains water but is not permeable to larger food particles.

Explanation;
Selective permeability means that a material or a substance allows the passage of some molecules or ions and other materials to pass through it, and inhibits the passage of others.
For example a cell membrane is semi-permeable and thus regulates the transport of materials such that some particles pass through while others can not cross. A semi-permeable membrane allows selective movement of materials, it acts like a filter that allows particles to pass or not according to their size, solubility, electrical charge, or other chemical and physical properties.

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Difference:
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The stem holds leaves.
The stem is green while the roots are brown
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