Why is Mars so much colder than the Earth?
A) because the albedo of Mars is higher than the Earth
B) because Mars has a much thinner, more diffuse atmosphere
C) because Mars has a little less gravity than the Earth
D) because Mars is farther from the Sun
Question 2
An atom of the element iron has an atomic number of 26 and an atomic mass number of 56. If it is neutral, how many protons, neutrons, and electrons does it have?
A) 26 protons, 30 neutrons, 26 electrons
B) 26 protons, 30 neutrons, 30 electrons
C) 13 protons, 56 neutrons, 13 electrons
D) 13 protons, 43 neutrons, 13 electrons
E) 26 protons, 56 neutrons, 26 electrons
Longer regions have more crossovers and thus higher recombinant frequencies
Plnaet Earth
The risk of dying before the age of 65 gets lower as family income gets higher.
A typical distillation curve. Heavier molecules evaporate at higher temperatures and contain more ...
Earth’s Revolution
Permafrost: High albedo, reflects as much as 90% of the Sun’s energy