Explanation:
who many chambers does the heart has
Answer:
Metamorphic rock
Explanation:
metamorphic rock formed when limestone is exposed to high temperatures and pressures. Marble forms under this condition because the calcite forming the limestone recrystallises forming a denser rock consisting of roughly equigranular calcite crystals.
thousands of years
Explanation:
A delta the size of the Mississippi River will take several thousand of years to form because the process of formation of a delta is geologically controlled.
A delta is a place where river enters or drains into the sea with many mouth or outlets.
Deltas are depositional terrain full of dis-tributaries.
- For a delta to form, a terrain must be close to the mouth of an ocean or a larger body of water.
- The entering stream must be large enough and have large amount of sediment.
- The river mouth must have been cut to the same level with that of the drainage basin.
- Most rivers such terrain should be at their lower course where they flow with very low velocity.
- Wave action should be minimal along such coasts.
These processes takes several thousands of years if not millions.
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28. A scientific theory explains an aspect of the natural world and can be tested repeatedly using the scientific method or experiments. This means that the explanations or content of a scientific theory is based on evidence gained through observation or experimentation.
The answer is True.
29. Scientific law is a statement that describes a a phenomenon that has been observed in repeated experiments. These statements are verified through the scientific method. Laws do not change; rather, they are applied to expand or broaden certain aspects.
30. Experiments are done to support, refute or validate existing theories. They show cause and effect insight through demonstration. These theories then may bring about laws in the scientific field.
The answer is then True.
31. I would get the Refrigerator A. The cost of running Refrigerator A is $10.00 a month, while B is $15.00 a month. This means the energy consumption is less with refrigerator A. Although B is cheaper, the energy consumption is much higher. In the long run, refrigerator A, would be a better investment.
32. Patterns of stars in the sky are called constellations. Constellations are a group of stars that form a recognizable pattern that is traditionally named after the mythological figure or whatever thing, animal or person that resembles the pattern.
The answer is B.
33. Ancient Greeks and Romans believed that the patterns in the sky represented mythological characters and animals. Examples of such would be Aries, Cancer, Capricornus, and the Big dipper. Romans mythology also depicts other celestial bodies as their gods, like mercury after the messenger god; Venus, the goddes of love and beauty.
The answer is C.
34. The sun in the solar system is a star. In fact, a star is considered or is called a sun if it is the center of a planetary system. Our own sun is the largest object that you can find in our solar system.
The answer is B.
35. The sun, is the closest star to Earth specifically. It is about 93 million miles away. It is brighter than the other stars because of its closeness. It makes up 99.8% of the total mass of our solar system.
The answer is B.
36. Light from the sun travels at the speed of light. It takes 8 minutes and 20 seconds for it to travel from the sun to the surface of the Earth at an average. It varies at times because the orbit of the Earth is elliptical.
The answer is A.
Complete question: <em>(Note: I failed to find the exact same question with its options, so I included many possible statements about convection)</em>
The mantle is the layer in which convection occurs causing the crust to move. Which statement below best describes the convection currents in Earth's mantle?
- They transfer potential energy away from Earth's core toward its crust.
- They transfer thermal energy away from Earth's core toward its crust.
- They transfer chemical and thermal energy in a circular pattern.
- They transfer chemical and potential energy in a circular pattern.
- Convection occurs in solids.
- Convection occurs in liquids and gases.
- Convection transfers thermal energy.
- Convection transfers potential energy.
- Convection occurs until all of the fluid is at the same temperature.
- Convection occurs only one time, no matter the temperature.
- thermal energy is transferred by physical contact
- thermal energy is transferred by electromagnetic waves
- thermal energy is transferred by movement in fluids
- thermal energy is transferred by mechanical waves
- the motion in a convection current horizontal
- the motion in a convection current vertical
- the motion in a convection current linear
- the motion in a convection current circular
Answer:
- They transfer thermal energy away from Earth's core toward its crust.
- Convection occurs in liquids and gases.
Convection transfers thermal energy.
Convection occurs until all of the fluid is at the same temperature.
- Thermal energy is transferred by movement in fluids.
- The motion in a convection current circular.
Explanation:
The <u>convection currents</u> are the result of heating by temperature gradients. Differences in temperature and density produce these currents. Warm materials are lighter and can ascend, while cold materials are heavier and denser, so they tend to descend. These materials movements create a circular motion pattern known as convective currents. They occur in the atmosphere, in the water, and the earth´s mantle.
In the last case, while the hot mantle emerges from the deepest areas, the cold mantle sinks, creating a circular convection current. These play an important role in fluids circulation and might be responsible for the movements of the lithospheric plates that are over the mantle. The temperature in the oceanic lithospheric plates is much inferior to the mantle´s temperature, so the lithospheric pieces sink, creating a descendent current.
Near the terrestrial core, the temperature might reach up to 3,500ºC, and solid materials in these areas melt and fuse. When fusing, materials lose density, becoming lighter and ascending again to the surface, creating the ascending currents. The currents of ascending materials are known as thermal feathers or plumes.
