The Presidential election in Nigeria in 1999 was significant
because it is the first election after the 1993 coup and it is the first
election of the Nigerian republic. In this election, Olusegun Obasanjo won over
Olu Falae. 62.78% of votes was casted under Obasanjo.
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.
Answer:
C) Ranching.
Explanation:
Basque settlers are settlers who have their origins in Spanish, Mexican, and other Hispanic roots. The Intermontane West were settlements of Native Americans and they were surrounded by rivers. The Spanish people were the first European settlers in this region. They made their living through ranching.
Today, the Intermontane West comprises of cities like Las Vegas, Utah, Nevada, etc. Tourism is also prevalent in this region as there are many interesting sights in the region. The region is surrounded by mountains and plateaus.
This would be by the influence of migration and distinct ethnic groups of each country
32 percent chance to look for something to look