Which is the best description of an igneous intrusion?

a. magma explodes to the surface and forms a smooth outer layer of rock.
b. igneous intrusions form when ice crystals splash into lava.
c. magma is exported to an open area and forms iron.
d. magma is injected into surrounding rock forming an igneous intrusion.

If the birth rate of a population of dolphins is 2.0, the death rate is 0.5, and the population size is 100, what is this dolphin's population growth?

What is the main fuel source for the work of the cell

When does a spring tide occur? question 9 options: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.