What do the dates next to nearly all sections of the wall show?

Why would the crystals in an intrusive igneous rock be larger than the crystals in a chemical sedimentary rock? a. intrusive rocks form beneath the earth's surface, so they cool very slowly, which produces larger crystals. b. chemical sedimentary rocks form from dissolved substances on the earth's surface with very high heat and cool very slowly, which produces smaller crystals. c. chemical sedimentary rocks and intrusive rocks have crystals of the same size. o d. chemical sedimentary rocks form deep in the earth, so they cool slower, which produces small crystals. € read question correct:

What can you learn about precipitation levels in south america from this map? brazil is experiencing a drought. it rains more in higher altitudes. peru received the highest level of rain. venezuela got less than 25 cm of rain. 

Rah is completing a school project on the expansion of fast food restaurants across the united states. she finds a map that shows a clear pattern of restaurants beginning in the east and expanding west. this map was most likely created using the technology of