Canadian shield is composed of Precambrian rocks that cover 2.8 million square miles.
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Sedimentary rock can be transformed into B. Metamorphic rock through heat and pressure.
Answer: Its presence is a good determinant of past hot climates. Its absence can also indicate cold climates.
Explanation:
18O and 16O are oxygen Isotopes, and are used in determining past climates. Heavier than the 16O with 10 neutrons and 8 protons, the 18O does not evaporate as easily and because of this, higher amounts are found in the tropics.
Together, they serve as good determinants of past climate by checking for their ratio in fossils.
Also the 18O isotopes are not present in polar regions as they precipitate before getting to higher altitudes. Cold areas, on the other hand, are high in 16O as they get trapped in glaciers. When climate changes in a location, the quantity of both of these oxygen isotopes also changes.
The justification hypothesis that the early Earth environment was void of oxygen is:
- atmosphere lacked oxygen but abundant in methane, ammonia, water vapour, noble gas, neon etc.
<h3>What did scientist proved about oxygen-less earth?</h3>
Studies revealed that the Earth's atmosphere was devoid of oxygen before more than 2.4 billion years ago.
However, some scientist proved that oxygen get brewing in the atmosphere from the oceans where a cyanobacterial photosynthesis occurred for about as 3 billion years ago.
Read more about Earth environment
<em>brainly.com/question/617302</em>
Answer:
C. Both experience low levels of precipitation.
Explanation:
Dry climate zones and high latitude zones are similar because both places experience low levels of precipitation.
- Dry climate zones are made up of deserts and steppes.
- Generally, dry climate zones are typified for their low precipitation all year round.
- High latitude zones are areas close to the poles
- The weather is generally cold and surface covered with ice.
- Precipitation is low here.
