Answer:
Explanation:
Nuclear fusion occurs in the core of a star. Stars use the process of nuclear fusion to convert hydrogen to helium, and this process provides energy for the star, making the star very hot and bright. When the star runs out of either hydrogen or helium and nuclear fusion in a star's core stops, the star is no longer creating energy. Without energy, the core cools and the outer layers of the star begin to expand and become less bright, and the star will eventually either collapse or explode.
Answer:
The presence of iridium in concentrations higher than 100 times the normal in the Cretaceous–Paleogene (K–Pg) boundary supports the Alvarez Impact Hypothesis.
Explanation:
Father and Son Alvarez argued that since iridium is present in extremely minute quantities on earth, its presence in very high concentrations in this layer which is thought to date back to 66 million years is evidence that an extraterrestrial impact took place which brought the iridium. The high destructive nature of the impact spread the iridium far and wide which deposited on the surface which is why it is present in this layer which dates back to that period.
Solar panels are expensive, they are kept this way by the companies.
The price ranges around $10.000 - $15.000 for an installation. It takes years to get this investment back and in the meantime the batteries need to be changed and power converter need to be maintenance, etc.
your answer is 4. sufficient sunlight reaches only a few locations
Answer:
1. Savanna, 2. Portuguese, 3. Sahara Desert, 4. plateau, 5. Ethiopian Highlands
Explanation:
- Tropical savanna consists of broad grasslands which are dotted with small trees and shrubs of all types. These are home to diverse flora and fauna and sometimes the grasses can grow up to tall as elephants.
- Portuguese were the first Christian settlers of the eastern African coasts and these were to first take over the East African countries like Kenya, Indian ocean and Tanzania.
- Sahara desert is the world's largest dry and barren desert is outside the polar areas located in northern Africa. And covers a surface area of 3.5 miles.
- A flat landscape is called a plateau, if this is relatively high and flat then its table or a plateau.
- Etho[ian highlands are the rugged mountains that are located in the horn region of northeastern Africa. Having a height of 4,550 meters above sea level and is considered to the roof of the world.
