At what temperature did water freeze on earth 1 billion years ago?
a. -100°c
b. -10°c
c. -5°c
d. 0°c

Impressions of tropical swamp plants were observed on rocks in polar regions. the impressions were dark black imprints, which means the fossils are examples of ( 1 ) the fossils tell us that polar regions ( 2 ) ( 1 ) a. carbonization b. mineralization c. trace fossils ( 2 ) a. had tropical plants that can grow in ice b. might have had a diffierent climate in the past c. will have abundent vegitation

Triangle xyz is translated 4 units up and 3 units left to yield triangle x'y'z' what is the distance between any two corresponding points on triangle xyz and trianglex'y'z' ?

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed