Explanation:
Differences in temperature lead to variations in air pressure around the world. Low-pressure areas are created when air rises. It is called low pressure because the weight of the air above the Earth's surface is lower than average. High-pressure areas are created when air sinks. It is called high pressure because the weight of the air is above average when it sinks to the Earth's surface.
Low-pressure areas are associated with cloud and precipitation (rainfall) because:
as the air rises it cools, condenses and forms clouds
the water droplets in the clouds increase in size
they eventually become too heavy to be held and fall as precipitation
The air above the Equator is very hot and rises, creating an area of low pressure. The Equator experiences high amounts of rainfall due to this rising air resulting in a warm and wet equatorial climate (eg the Amazon and Congo tropical rainforests).
High-pressure areas are associated with dry, warm and settled weather conditions. This is because sinking air does not result in precipitation.
The answer is The unsorted sand and rock is the least porous. The porousness of a solid material is dependent on the size of holes within it. This can be tested by how quickly, the material can pass a liquid through it. The bigger the holes, the higher the porousness, In this case, the unsorted sand and rock have the smallest holes between its particles.
Answer:
Russia is the largest country in the world in land area.
The Ural Mountains lie mainly along the 60° East Longitude Line.
Explanation:
Russia is the largest country in the world in land area, and it is the biggest by far. The country stretches from the Baltic Sea in the west to the Pacific Ocean in the east, and from the Arctic Ocean in the north to the Caucasus and Central Asian steppes. The size of the country has created a lot of good conditions for development (a lot of natural resources) but also some problems (huge distances and inhospitable climate).
The Ural Mountains are a mountain chain in Russia. They are stretching in a roughly north-south direction from the Arctic coastline to the Caspian Sea coastline. This mountain range lies roughly on the 60° East Longitude Line. The Ural Mountains, in their peak, were among the highest mountains in the world, and they are also among the oldest mountains still in existence, but over the course of hundreds of millions of years the erosion has been leveling them and they are now ranging from low to medium height.
