2. During Earth's very early history, our planet was whacked by meteorites large and small, and eventually grew to
its current size. Earth probably went through a period in which it was molten from near the surface to its center.
Throughout its history, Earth has been hotter at its center than at its outer surface.
(a) In caves just below Earth's ground surface in continental crust, the temperature tends to be a constant
-15°C (-59°F). (That's why people use caves for wine storage.) The deepest mine on Earth is currently the Mponeg
gold mine just southwest of Johannesburg, South Africa, which reaches just over 4 km below the surface. At the
bottom of that mine, the rock temperature reaches 66°C (-151°F). Using the cave temperature to represent the
surface temperature of the crust at -0 km depth, what is the rate at which temperature changes in Earth between
O and 4 km-the near-surface geothermal gradient?
°C/km
Answers: 2
Geography, 23.06.2019 02:30
Which of the following east asian contries are a peninsula? a. china b. taiwan c. south korea d. mongolia
Answers: 2
Geography, 23.06.2019 15:10
During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic
Answers: 3
Geography, 24.06.2019 00:30
Which two nations are doing the most to combat their environmental issues?
Answers: 1
2. During Earth's very early history, our planet was whacked by meteorites large and small, and even...
Mathematics, 04.06.2021 21:00
Mathematics, 04.06.2021 21:00
Mathematics, 04.06.2021 21:00
Mathematics, 04.06.2021 21:00
Mathematics, 04.06.2021 21:00
Mathematics, 04.06.2021 21:00
Mathematics, 04.06.2021 21:00
Mathematics, 04.06.2021 21:00
Mathematics, 04.06.2021 21:00