In which situations is the principle of cross-cutting relationships useful in determining relative age? check all that apply.

a fault breaks through sedimentary layers.
the formation of an intrusion in the earth’s surface.
igneous rock forms between sedimentary layers.
sedimentary layers form over millions of years in a lake bottom.
lava flows form on top of one another from several eruptions over time.

Answer:      

Formation of an intrusion in the earth’s surface and igneous rock that forms between sedimentary layers are examples of situations where the principle of cross cutting relationships is useful in determining relative age.

Explanation:

Cross cutting relationships principle in geology states that when a geographic feature cuts into another the feature that cuts into the other will be the younger feature. This principle is widely used in relative dating. There are several examples of such cutting features.

In case of a volcanic eruption sometimes the magma may push into the crevices and cracks of existing rocks.

When this magma cools down it solidifies to form igneous rocks and this igneous rock is example of geologic feature that cuts into another geologic feature. It can be called an intrusion. This igneous rock will be younger than the rock.  

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

answer and explanation;