Answer:
C. At least five mass-extinction events have occurred during the last 500 million years.
Explanation:
- The history of mass extinct is related to the five mass extinctions that are caused over by the 350 million years n which many species have disappeared in there short geologic time.
- A massive extinction is caused in the Permian Triassic extinction event i.e about 250 mn years ago which on an estimate has killed 90% of the species.
- The Cretaceous–Paleogene extinction event that occurred over 66 million years ago is known to have wiped out the dinosaurs and many other species.
Answer:
Hydrogen and part oxygen
Explanation:
Water is composed of these two which makes the symbol H20
Climate of Russia
This area of Russia is famous for its extreme climate with very cold winters, but warm to hot summers, although they tend to be short and wet. ... The north and northeastern areas around the Black Sea have milder winters, but frequent rainfall all the year round.
Climate of Finland
July temperatures in Finland average 13 to 17°C. February is usually Finland's coldest month, with temperatures averaging from - 22 to -3°C. In northern Finland, winter temperatures often drop as low as -30°C or even down to -50°C, sometimes with strong, cold easterly or northeasterly winds.
Climate of Minnesota
Minnesota has a continental climate, with hot summers and cold winters. ... Temperatures as low as −60 °F (−51 °C) have occurred during Minnesota winters. Spring is a time of major transition in Minnesota.
Natural gas made due to pressure and under buried layers of rock over millions of years ago
