Precious metals are rare, naturally occurring metallic chemical elements. They tend to be less reactive than most elements, are usually ductile and have a high lustre. Precious metals have high economic value. Examples are: gold,silver and platinum. Gems on the other hand are minerals or rocks that can be cut, shaped, and polished into beautiful stones. Examples include emerald, ruby and sapphire.
Both precious metals and gems are rare and valuable.
Transitional stress. is NOT a type of stress seen in rocks. Correct answer: B
Transitional stress is social type of stress, that denotes mental stress that is a result of transition periods in the life and stems from one's relationships with others and from the social. Rocks experience geological type of stresses.
The correct answer is - Tundra is much cooler than deserts, so less water evaporates during the growing season and the tundra stays more moist.
The tundra is a very cold biome. In fact, most of the year is winter, and there is only a short period of time when it is summer, and that is not really a summer in the true sense of the word, as it is relatively cold and fresh.
Since for most of the year the tundra is frozen, the water is not evaporating, and during the very short ''summer'', it defrosts, so it becomes all very marshy, and that allows the plants to grow there.
Also, because the summer so short and relatively cold, the evaporation of the water is minimal, so most of the water just frozen again in the winter.
Answer:
When the entire lake reaches 40 F, the surface water cools further, dropping below 40 F. Because this water is now less dense than the surrounding water, it will stay on the top and continue to cool. Once the surface water falls to 32 F, it freezes. The freezing then spreads downward into the lake and the ice thickens
Explanation:
