False, igneous rocks may classified by chemical composition but may not be crystallized together in the same rock. SO there are always different minerals in igneous rocks.
The correct answer is - 45 percent.
Since the clock produces 45 useful unites energy units for every 100 unites of energy that it uses, than it turns out that the efficiency of the clock is 45 percent.
In such cases, the person who wants to change it has to show a receipt of the purchase. If the person does not have a receipt and still persists you can call the manager and the manager can solve it. If the manager is not there, you can say that there's nothing that you can do and that the person can return at a later time when the manager might be there. You can also point them to your customer service.
Please appreciate how I just wasted like 1 hour and 30 minutes of my life for only 8 points. I like to be organized and such so I put them all in order thanks to google maps! But here ya go! Hope this Helps. (Tip: Just use google maps and look at north american countries and such)
Antigua and Barbuda
Bahamas
Barbados
Belize
Botswana
Burundi
Cameroon
Canada
Cook Islands
Dominica
Eswatini
Fiji
The Gambia
Ghana
Grenada
Guyana
India
Ireland
Jamaica
Kenya
Kiribati
Lesotho
Liberia
Malawi
Malta
Marshall Islands
Mauritius
Federated States of Micronesia
Namibia
Nauru
Nigeria
Niue
Pakistan
Palau
Papua New Guinea
Philippines
Rwanda
Saint Kitts and Nevis
Saint Lucia
Saint Vincent and the Grenadines
Samoa
Seychelles
Sierra Leone
Singapore
Solomon Islands
South Africa
South Sudan
Sudan
Tanzania
Tonga
Trinidad and Tobago
Tuvalu
Uganda
Vanuatu
Zambia
Zimbabwe