Which of these volcanic eruption types is the most violent? A. Hawaiian
B. Fissure
C. Plinian
D. Strombolian

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite

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. 

The language and religion of france developed from which people? a. the franks b. the gauls c. the anglo-saxons d. the romans