In the Northern Hemisphere the reason that cold fronts are often
preceded by rain and cloudy weather
which quickly clears to reveal bright,
clear skies and sunshine, accompanied
by colder temperatures is primarily
due to the fact that-
A low pressure systems that push
cold air south often accumulate
unstable moisture in front of them.
B high pressure systems that push
cold air south often accumulate
unstable moisture in front of them.
C water cannot evaporate in very
cold air, so rain storms cannot
develop behind cold fronts.
D winds only blow on higher
temperature days.

80 points pls brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

Which is the best example of plant tissue? the answer is d (just took the test)