Answer:
Explanation:
Horses allowed Native Americans to travel to find food and other supplies. Horses also helped strengthen military power. Horses were not the only animals making a large impact on the Americas.
Answer:
The following is NOT part of the definition of a mineral: c. can be produced by natural or laboratory processes. Is glacial ice a mineral? d. Yes. Which type of bonds results when two atoms share electrons? d. Covalent
Explanation:
Mineral are composed of specific chemical elements. The are organized and their atomic structure forms crystals. They occur naturally and they are associated with rocks. The reason why they are inorganic is because they do not contain carbon, however, they can be produced by organic processes. Therefore, c. is NOT part of the definition of a mineral. Following the same principles, ice is considered a mineral because it is composed of one single chemical molecule (H2O), it occurs naturally and it contains a well organized crystal structure. The process of sharing two atoms is called covalent bond. In an ionic system, the electron is transferred to another atom so the concept of sharing is limited to the covalent bond.
A man named Alfred Wegener proposed that all the continents were one, giant continent which he called Pangaea. He backed up this idea with evidence from other fossil remains. Fossils from animals native to a certain country were appearing on other countries from much further away.
Answer:
Fuels such as coal, petroleum release unburnt particles in the environment. The particles result in air pollution and cause respiratory diseases such as respiratory illness, lung damage, ozone (smog) effect, reduces the ability of blood to bring oxygen to the blood cells and tissues, liver and kidney etc.
Answer:
TRUE
Explanation:
Rainwater is comprised of both oxygen and carbon dioxide which is essential for the growth of plants, and is acidic in nature. During the time of occurrence of rainfall, the rainwater gets mix up with the soil, and helps in releasing the essential micro-nutrients such as zinc, iron, copper into the soil and thereby enhances the growth, development and expansion of plants.
In addition to this, rainwater also helps in leaching the salt concentration downward into the deeper root zone, which obstructs the growth of plants.
Thus, the given statement is true.
