The border separates Sonora and Chihuahua is Natural boundary
Answer:
Our Sun is just one star among the hundreds of billions of stars in our Milky Way Galaxy. ... Galaxies come in many sizes. The Milky Way is big, but some galaxies, like our Andromeda Galaxy neighbor, are much larger. The universe is all of the galaxies – billions of them!
Answer choices B, C, and , D are correct.
I believe the correct word to fill in the blank is water. In moist climates, water tends to dissolve limestone near the surface, resulting in cave formation since limestone is soluble to water. Hope this answers the question. Have a nice day.
Explanation:
after earth cooled down from being a large ball of molten lava , the water vapour in gaseous state turned into liquid and it poured rain for thousands of years filling all the oceans we see now and as the rocks were filled with salts and minerals the ocean became salty
