D. high and low levels of silica in the different type of lava.
Explanation:
The volcanoes have different types of explosions. Some tend to be highly explosive, some less explosive, some don't have explosions at all, while some have combinations of different eruptions. The reason for this diversity in the eruption types is mostly the composition of the magma, or rather how high is the silica content in it.
Basically, the higher the silica level in the magma the higher the explosiveness, and the lower the silica level the lower the chances of explosiveness. This is the case because the higher amount of silica makes the magma thicker, so the gasses are trapped and they explode, while when the lower silica content makes the magma less thick, so the gasses are not trapped and explosions are lacking.
Answer:
1km
Explanation:
A scale of 1:25,000 means that 1 meter on the map equals 25,000 meters on the ground.
So,
Converting 4cm to meter;
4cm/100 = 0.04m
If;
1m = 25,000m
0.04m = ?
25,000 * 0.04 = 1000m
Answer:
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Explanation:
Answer: Option (1)
Explanation: In an occluded front, the cold air overtakes or completely replaces the warm air in the atmosphere. It generally forms at the region where the atmospheric pressure is relatively low.
Due to the presence of an occluded front, the direction of wind and the temperature varies i.e the temperature could be high or low and the wind may be strong or weak. in addition to that there might be occurrence of a heavy rainfall as well as thunderstorms.
Thus the correct answer is option (1).
