Questions

Government can be classified in three manners:

(1) who participates,

(2) geographic distribution of power, and

(3) legislative/executive relationship.

Who can participate is generally broken down into two forms of government,

democracy or dictatorship

While the legislative/executive relationship is broken down into

presidential or parliamentary

The geographic distribution of power is broken down into unitary, federal, and confederation (confederal).

Confederal System of Government ::

A system of government where power is located with the independent states and there is little power in the central government.

Today, no nation follows a confederal system. Organizations, like the European Union and the Commonwealth of Independent States, are based on the ideas of a confederal system. Several nations make up these organizations, but they still retain the majority of their independence.

No work done as there is no external external pressure in free expansion. 

Hence, Work done in a free expansion process is Zero.

The Sahara is the largest non-polar desert in the world. The Sahara is the largest hot desert and the third largest desert in the world after Antarctica and the Arctic.

The desert covers large sections of Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia. It covers 9 million square kilometers (3,500,000 sq mi), amounting to 31% of Africa.

Its borders include the Mediterranean Sea to the north, the Atlantic Ocean to the west and the Red Sea to the east.

Uranus is 2,870 million kilometers away from the sun and the time taken to complete one round at a speed of 6.8 km/sec is as  long as 84 years on earth

Fiords are along narrow inlets into the sea-coast with steep sides. It usually occurs along the coast of a mountainous region.It has been formed by glacial action.

Nuclear binding energy is the minimum energy that would be required to disassemble the nucleus of an atom into its component parts. These component parts are neutrons and protons, which are collectively called nucleons.