<em>open lake </em>is a lake where water constantly flows out under almost all climatic circumstances. Because water does not remain in an open lake for any length of time, open lakes are usually fresh water: dissolved solids do not accumulate. Open lakes form in areas where precipitation is greater than evaporation. Because most of the world's water is found in areas of highly effective rainfall, most lakes are open lakes whose water eventually reaches the sea.
<em>closed lake </em>(see endorheic drainage), no water flows out, and water which is not evaporated will remain in a closed lake indefinitely. This means that closed lakes are usually saline, though this salinity varies greatly from around three parts per thousand for most of the Caspian Sea to as much as 400 parts per thousand for the Dead Sea. Only the less salty closed lakes are able to sustain life, and it is completely different from that in rivers or freshwater open lakes.
The tropical rainforest is a biome with a constant temperature and a high rainfall. The level of humidity and density of the vegetation give the ecosystem a unique water and nutrient cycle. Rainforests around the world are threatened by human expansion.
Answer:
March equinox is day during the year when all the daylight of the sun is asme at sunrise and sunset.
Explanation:
- Equinox is the time when the plane of the earth passes through the centre of the sun. Occurring around 23 March and 23 Sept. The vernal equinox is also called as the spring equinox.
- The azimuth of the sun is the angle of the sun's position defined by the relative direction along the horizon. However the most commonly followed convection for analyzing the sun radiation is 90 degrees east, south 180 degrees and west is 270 degrees.
- As sunrise and sunset are defined by the upper limb of the solar disk. These conditions produce patterns of night and day as the sun appears to move just above the horizon at an angle of 0.39 degrees per day as the equinox passes.
Your question could mean one of two different things.
You could be asking "How do I figure out the longitude and latitude
of, let's say, Killeen, Texas."
The answer to that is: You look on a map or a globe that has latitude
and longitude lines printed on it, find Killeen, Texas, and estimate its
coordinates as well as you can from the lines printed nearest to it.
Or you could be asking "If I'm out in the middle of the ocean at night,
how do I figure out the longitude and latitude of where I am ?"
I'm afraid the answer to that is far too complicated to write here.
All I can say is: The science of "Navigation" was developed over a period
of hundreds of years. If you look at the history of sea exploration through
the centuries, you see how the explorers ventured farther and farther from
their home ports as time went on. The reason for that is that they were
developing better and better methods of figuring out where they were as
they sailed.
And about 20 years ago, that all changed. Drastically. Now, anybody at all
can walk into his neighborhood sporting-goods store, and buy a little device
that fits in his shirt pocket or in the palm of his hand, and whenever he has a
view of the sky, it can give him the latitude and longitude of the place where
he's standing, more accurately than the best navigators in the US Navy or
the British Armada could ever calculate it before.
That was when countries started putting up bunches of little satellites
to broadcast signals to our pocket receivers.
The satellites that the US put up are called the Global Positioning System . . .
the GPS.
Theres 3 types of climates there arid, semiarid and temperate
