Answer:
ponds cooler than 20 °C
Explanation:
There is great effect of temperature on the dissolved oxygen in a pond water,
When the water is hotter it will hold less oxygen but when the water is cold it will holds more oxygen. Therefore, ponds cooler than 20 °C will will have a higher average oxygen concentration.
Answer:
Cleavage
Luster
Streak
Hardness
Explanation:
Cleavage is the ability of a mineral to split apart easily along flat surfaces and it is dependent on the mode of formation and properties of the mineral.
Luster is the way light is reflected from the surface of the mineral. Some minerals allows a greater reflection of light due to their shiny surfaces while some don’t.
Streak is the color of the mineral's powder which are its unique components and also helps in the identification of minerals.
Hardness of a mineral can be measured by the Mohs scale. This is usually measured on a scale of 1-10. The hardest being 10 on the scale.
Answer:
because as we move further forward the equator the sun rays become slanting thereby the polar regions receive slanting rayd if the sun and is usually cold
The iron in the dust reacts with oxygen
C. Saudi Arabia. It is right answer.
