Questions | 5 |
Topics | Carbon Cycle, Compound, Doppler Effect, Electromagnetic Spectrum, Health Benefits of Vitamins & Minerals |
The carbon cycle represents the ciruit of carbon through Earth's ecosystem. Carbon dioxide (CO2) in the atmosphere is absorbed by plants through photosynthesis. Plants then die and release carbon back into the atmosphere during decomposition or are eaten by animals who breathe (respiration) the carbon into the atmosphere they exhale and produce waste which also releases carbon as it decays.
A compound is a substance containing two or more different chemical elements bound together by a chemical bond. In covalent compounds, electrons are shared between atoms. In ionic compounds, one atom borrows an electron from another atom resulting in two ions (electrically charged atoms) of opposite polarities that then become bonded electrostatically.
The Doppler effect occurs when the source or listener (or both) of sound waves is moving. If they're moving closer together, the listener perceives the sound with a higher pitch and, when they're moving apart, the listener perceives the sound with a lower pitch.
The electromagnetic spectrum covers all possible wavelengths and frequencies of radiation. From lowest frequency (longest wavelength) to highest frequency (shortest wavelength) radiation: radio waves → microwaves → infrared waves → visible light → ultraviolet light → X-rays → gamma rays.
Vitamin / Mineral | Sources | Health Benefits |
---|---|---|
Calcium | Dairy products (milk, yogurt, cheese), spinach. | Aids bone growth and repair, muscle function. |
Iron | Red meat, beans, whole grains. | Allows red blood cells to transfer oxygen to body tissues. |
Magnesium | Nuts, whole grains, green leafy vegetables. | Muscle, nerve, and enzyme function. |
Potassium | Bananas, nuts, seeds. | Helps balance fluid levels in the body. |
Vitamin A | Liver, milk, eggs, carrots. | Vision, immune system, cell growth. |
Vitamin C | Green and red peppers, citrus fruits, broccoli. | Collagen formation, immune system function, antioxidant (helps protect cells from damage). |
Vitamin D | Exposure to sunlight. | Helps calcium strengthen bones, muscle, nerve, and immune system function. |