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- 1. cycle-It involves the exchange of heat energy, which leads to changes in temperature and moisture levels in the atmosphere, oceans, and land. The water cycle is driven by solar energy and involves several stages including evaporation, transpiration, condensation, precipitation, infiltration, and runoff.
- 4. A front is a weather system that is the boundary separating two different types of air. One type of air is usually denser than the other, with different temperatures and different levels of humidity. This clashing of air types causes weather: rain, snow, cold days, hot days, and windy days.
- 6. The four seasons—spring, summer, fall, and winter—follow one another regularly. Each has its own light, temperature, and weather patterns that repeat yearly. In the Northern Hemisphere, winter generally begins on December 21 or 22. This is the winter solstice, the day of the year with the shortest period of daylight.
- 9. Pressure- Low blood pressure occurs when blood pressure is much lower than normal. This means the heart, brain, and other parts of the body may not get enough blood. Normal blood pressure is mostly between 90/60 mmHg and 120/80 mmHg. The medical word for low blood pressure is hypotension.
- 12. move or cause to move into a sloping position.
- 13. a straight line about which a body or a geometric figure rotates or may be supposed to rotate. the Earth's axis. Or a straight line with respect to which a body or figure is symmetrical.
- 15. an imaginary line drawn around the earth equally distant from both poles, dividing the earth into northern and southern hemispheres and constituting the parallel of latitude 0°.
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- 2. Tides are very long-period waves that move through the ocean in response to the forces exerted by the moon and sun. Tides originate in the ocean and progress toward the coastlines where they appear as the regular rise and fall of the sea surface.
- 3. The answer is gravity: an invisible force that pulls objects toward each other. Earth's gravity is what keeps you on the ground and what makes things fall.
- 5. Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius. Temperature indicates the direction in which heat energy will spontaneously flow—i.e., from a hotter body (one at a higher temperature) to a colder body (one at a lower temperature).
- 7. n meteorology, a cloud is an aerosol consisting of a visible mass of miniature liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body or similar space. Water or various other chemicals may compose the droplets and crystals
- 8. In a broader sense, climate is the state of the components of the climate system, including the atmosphere, hydrosphere, cryosphere, lithosphere and biosphere and the interactions between them.
- 10. Disasters- The hurricane that struck Galveston, Texas, in 1900 remains the deadliest natural disaster in North American history, with some death toll estimates reaching 12,000.
- 11. Pressure- Hypertension (high blood pressure) is when the pressure in your blood vessels is too high (140/90 mmHg or higher). It is common but can be serious if not treated. People with high blood pressure may not feel symptoms.
- 14. phases-In common usage, the four major phases are the new moon, the first quarter, the full moon and the last quarter; the four minor phases are waxing crescent, waxing gibbous, waning gibbous, and waning crescent.