What is the Difference Between an Intrusion and a Extrusion rock?

The two main categories of igneous rocks are extrusive and intrusive. Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.

The other is extrusion, such as a volcanic eruption or similar event. An intrusion is any body of intrusive igneous rock, formed from magma that cools and solidifies within the crust of the planet. In contrast, an extrusion consists of extrusive rock, formed above the surface of the crust.

Explanation:

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intrusion starts with an i and extrusion starts with an e

Explanation:

If the producer population decreased then the size of the herbivore population would decrease as well.  This is because the herbivores have less food overall to eat so herbivores will die off until herbivores all have food.  So your answer would be it would decrease