True
Explanation:
An unconformity between two parallel layers of sedimentary rocks is classified as a disconformity.
A disconformity is a type of unconformity.
An unconformity is a significant break in the stratigraphic record of a formation. There are different types of unconformity;
- A disconformity is an unconformity between parallel layers of sedimentary rocks.
- A non-conformity is an unconformity between two different rock types.
- A para-conformity is an unconformity between two parallels layers marked by differences in fossil age.
- An angular unconformity is an unconformity between two layers that are at an angle to one another.
The main cause of unconformity is usually non-deposition and erosion.
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Oxygen makes up 21 percent of the earths atmosphere
The answer would be D.all the above
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Greenhouse emissions of tar sand, per barrel, are more than conventional crude oil. This is because, it takes more energy to extract the bitumen from the tar sand and more so, to convert the bitumen to usable oil taking up even more energy. This energy is usually derived from burning natural gas. Emissions by tar sand are approximately 100 kg CO2 per barrel while conventional oil is approximately 30 kg CO2 per barrel.
Answer:
A) The ice lobes advanced and stopped many times, eroding the land to create a trough and then filled it with draining water from the ice sheet that was feeding them.
Explanation:
- The creation of the Minnesota rover started when the bottom was an oversized valley having its roots in the ice ages when the glacier repeatedly moved 2 to 10,000 million years ago. For about 120-150,000 years ago the ice sheets formed by the lobes of ice in Minnesota and it was covered by moraine and glacial deposits.
