Question

1. choose the best answer.

the earths — shields the earth from charged particles sent out by the sun and exists because of the spinning of iron metal in the core.
lithosphere
magnetic field
ionosphere
radioactivity

1. choose the best answer.

what is the mohorovicic discontinuity, or moho?
it is the location in the earths core where magnetic forces cancel one another.
it is the fault where the most powerful earthquakes and volcanoes form.
it is a difficult and little - understood region deep in the pacific ocean.
it is thick, heavy rocks marking the boundary between the crust and the mantle.

Explanation:

The Earth's magnetic field shields the planet from charged particles emitted by the Sun. This magnetic field is generated by the motion of molten iron in the Earth's outer core, a process known as the geodynamo. The lithosphere is the rigid outer layer of the Earth, the ionosphere is a layer of the atmosphere, and radioactivity is related to the decay of atomic nuclei.

The Mohorovičić discontinuity (Moho) is the boundary between the Earth's crust and mantle. It is marked by a change in seismic wave velocity due to the different compositions and densities of the crust and mantle. The other options describe different geological features: a fault where earthquakes and volcanoes form is a tectonic boundary, a difficult - to - understand region in the Pacific Ocean is too vague, and thick, heavy rocks marking a boundary is a general description that does not specifically define the Moho.

Answer:

1. magnetic field
2. It is thick, heavy rocks marking the boundary between the crust and the mantle.