Latitude 60 north, longitude 90 east, I’m not too sure tho that’s just what I think :)
Answer:
1. Egypt
2. South Africa
3. Libya
4. Sudan
5. Kenya
6. Nigeria
7. ?
8. Rwanda
9. Arabian Sea
10. Strait of Gibraltar
11. I don't see it??
12. Sahara Desert
13. Sahel
14. Cape Town
15. ?
16. Lake Victoria
17. Atlantic Ocean
18. Indian Ocean
19. Mediterranean Sea
20. Niger River
21. Congo River
22. Nile River
23. Cairo
24. Pretoria
25. Mt. Kilimanjaro or Nairobi?
26. Lagos
27. I don't see 27??
28. Rabat
Explanation: I'm going to do some more research lol
More than 75 percent
Explanation:
Let us carefully analyze this problem:
The half life of the rubidium isotope = 50 billion years
The half-life of a radioactive isotope is the time it takes for it to decay to half of its original amount.
Every 50years, we know that a rubidium isotope would split into half.
Initially when the isotope was formed, we would only have the parent atoms there. There wont be any daughter;
ratio of parent to daughter = 100 : 0
When the isotope decays to half; we would have equal number of parent and daughter:
ratio of parent to daughter at half life = 50 : 50
The age of the earth is about 4.6billion years;
this is;
x 100 = 9.2% of the half-life of the rubidium isotope.
At this time, we should know that only 9.2 percent of the daughter would have been formed.
The remaining parent would be 100 - 9.2 = 90.8% would still be left undecayed.
The ratio of parent to daughter = 90.8 : 9.2
This is more than 75% of the parent
learn more
Radioactive decay brainly.com/question/10125168
#learnwithBrainly
Sedimentary rock layer is the most complex
An estimated 21,000 people have been affected by the cyclone, many of them children. In addition, at least 77 classrooms and six health centres have been partially or completely destroyed, leaving 2,000 students out of school and communities without access to health services.