Question

why are intrusive rocks usually coarse grained​

Answer 1

Explanation:

ɪɴᴛʀᴜsɪᴠᴇ ʀɪᴄᴋs ᴄʀʏsᴛᴀʟʟɪᴢᴇ ғʀᴏᴍ ʙᴇɴᴇᴀᴛʜ ᴛʜᴇ ᴇᴀʀᴛʜ's sᴜʀғᴀᴄᴇ.ᴛʜᴇ ᴛᴇxᴛᴜʀᴇ ᴏғ ᴀʙ ɪɢɴᴇᴏᴜs ʀᴏᴄᴋ ɪs ᴅᴇᴘᴇɴᴅᴇɴᴛ ᴏɴ ᴛʜᴇ ʀᴀᴛᴇ ᴏғ ᴄᴏᴏʟɪɴɢ ᴏғ ᴛʜᴇ ᴍᴇʟᴛ sʟᴏᴡ ᴄᴏᴏʟɪɴɢ ᴀʟʟᴏᴡ ʟᴀʀɢᴇ ᴄʀʏsᴛᴀʟ ᴛᴏ ғᴏʀᴍ, ғᴀsᴛ ᴄᴏᴏʟɪɴɢ ʏɪᴇʟᴅs sᴍᴀʟʟ ᴄʀʏsᴛᴀʟs

Answer 2

Intrusive or plutonic rocks crystallize from magma beneath the earth's surface. ... The texture of an igneous rock (fine-grained vs coarse-grained) is dependent on the rate of cooling of the melt: slow cooling allows large crystals to form, fast cooling yields small crystals....