The iron in the earth's core is solid due to high pressure.
At the center of the earth is solid inner core, whose size is two-thirds of moon's size mad made up primarily of iron. The temperature in this core is equal to that of the sun's surface at 5,700 degrees Celsius. But the tremendous pressure caused by gravity prevents the iron from becoming liquid.
Surrounding this is the outer core made of nickel and small quantities of other metals and these remain liquid because the pressure here is a bit lower.
Answer:
1. giant impact forms moon
2. end of heavy bombardment
3. early life (based on fossil evidence))
4. oxygen buildup in atmosphere
5. earliest mammals
6. dinosaurs go extinct
7. earliest humans
Explanation:
The Earth has a very interesting past, with lot of changes and turnarounds in it. If we sum it up quickly, we can say that soon after the Earth formed and collided with another large space object, part of the Earth was torn away, which eventually formed the moon. The Earth was constantly bombarded by meteorites and asteroids, but that came to an end as the atmosphere was becoming denser and denser. The first life started to develop in the oceans in the form of cyanobacteria, which used photosynthesis, and were constantly releasing oxygen, building it up int he atmosphere. The oxygen changed the living conditions, enabling the life to thrive and diversify. The dinosaurs and mammals eventually came on the scene, with the dinosaurs coming first by around 20 million years, giving them the edge to become the dominant life form. The mammals lived in the shadows until the dinosaurs existed, but their reign ended with a large meteorite collision. This prompted the quick evolution and diversification of the mammals, quickly becoming the dominant life form, and just few million years ago they gave rise to the earliest human ancestors, the hominids.
Among the many benefits of the building of the Aswan Dam are:
a. prevention of flooding of the Nile River
b. production of hydroelectric dams that power parts of Egypt
c. the advantage of water storage for future use.
The Aswan Dam is considered to be the low dam that the government of Egypt projected to be constructed at $3.1 Billion where Egypt had taken financial support from the World Bank and other donors.
The answer to this question is C. In the 1800s mexico and the United states fought for territory near Texas, and eventually won after many engagements, such as the Alamo. Hope I helped.
Answer:
Polluting energy system are given below.
Explanation:
- Polluting Energy Systems like the Industrial systems that are stationary power systems along with the mobile pollutant system like vehicles and examples of heating systems like those of the air furnaces, hot water boilers, and electric heat pump.
- Example of Propulsion System is spacecraft and aircraft from a launch vehicle. Turbines are also characterized by having a propulsion system. Cooling Systems like the coolants in vehicles, computers and air conditioners and refrigerators, etc.
- All these follow the traditional energy system models as they stay locked from outside and derive the system by the energy created due to electric induction.
