1. The answer is B. the asthenosphere
Asthenosphere is a layer of the Earth situated below the lithosphere. It is a semi-fluid and ductile rock or partly molten rock. Due to semi-fluid state of asthenospheric rock, it behave like a plastic and flow gradually. Thus, causes movement of continents.
2. The answer is C. collision between tectonic plates
The Earth’s crust becomes unstable when tectonic plates meet. As the plates slide past each other and push against each other. This causes earthquakes and volcanic eruptions at the edge between the plates.
political features on maps include boundaries for countries and states
<u>Answer:</u>
<em>Cirques often contain small lakes called </em><u><em>tarn</em></u><em>.
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<u>Explanation:</u>
Cirque is a depression or a valley-like formation developed from the erosion of the glacier. They are formed in the mountain ranges. The slopes are steep and melted ice flows down to the floor.
The floor of a cirque is a bowl-shaped structure. The ice from all the sides from melting glaciers fill in the floor. When the glacier melts and slides the sides of the cirque, the floor converts into a lake. This small lake is called a tarn.
Unconfined state not confined by impermeable material