The climate in northern Russia determines the vegetation to be of tundra type.
Explanation:
Northern Russia is on a very high latitude, and very close to the North Pole. Because this area receives very little and very scattered sunlight, it is very cold for most of the year. That has resulted in the area being frozen for most of the year, the growing season to be very short, and the soil quality very poor.
The vegetation that exists here has had to develop special adaptations because of the extreme conditions. It is vegetation of tundra type. This vegetation is usually very small, from few mm to few cm. The requirements for nutrition are very low, with very small roots, and adaptations on the surface to prevent water evaporation and freezing. Such plants are:
- mosses
- lichens
- dwarf shrubs
- sedges
- grasses
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Answer:
What do you mean by sending this ?
Geography can be understood in five different themes. They are:
• Location
• Place
• Human-Environment Interaction (HEI)
• Movement
• Region
Answer:
B and C
Explanation:
B. In a given rock sample, the amount of Silicon-32 isotopes gets divided in half about every 170yrs.
This is the concept of half-life. Half life is the time take for half of a radioactive isotope to disintegrate. The shorter the half life the faster the isotope disintegrates.
From the question, we were told that it would take 170yrs for half of the isotope of Silicon to disintegrate to Phosphorus. This is the half life.
C. The half life can be used to determine the amount of Si-32 that has decayed from the time closure temperature was reached.
The closure temperature is very important in radioactivity. It is the temperature at which a system has cooled and there is no resulting disintegration of parent and daughter isotopes.
From first order kinetics, we know that the rate at which radioactive elements decay at any time is directly proportional to the number of radioactive atoms present. A knowledge of the half life helps to figure out the number of atoms that has decayed in time.
