Answer: high-energy primary cosmic-ray particles interact with air nuclei high in the atmosphere, initiating a cascade of secondary interactions that ultimately yield a shower of electrons, and photons that reach ground level.
Explanation:
Answer: The Dust Bowl was caused by several economic and agricultural factors, including federal land policies, changes in regional weather, farm economics and other cultural factors. After the Civil War, a series of federal land acts coaxed pioneers westward by incentivizing farming in the Great Plains.
Explanation:
1) Manifest Destiny: The US Government wanted settlers to move onto the Plains as they needed the land to be settled and farmed and for communities and towns to grow up and expand. This was needed if the USA was to be a rich and successful country. The government therefore promoted the idea of Manifest Destiny.
Answer:
true
Explanation:
By experimentating your testing a theory or hypothesis based on certain criteria to see if your theory is correct. By experimentating you record data to back up your claims.
The theory or hypothesis is just your guess of what may or may not happen based on the criteria your wanting to prove.
Answer:
lenticels appear on the surface of the bark as raised scars containing oval or rounded depressions. Lenticels are large sized aerating pores present in the cork tissue for gaseous exchange.it exchanges gases minerals,etc.
Ferns are examples of spermatophytes which have stems growing side ways
